diff --git a/src/app/(main)/blocked_slots/[slotId]/page.tsx b/src/app/(main)/blocked_slots/[slotId]/page.tsx
new file mode 100644
index 0000000..893253c
--- /dev/null
+++ b/src/app/(main)/blocked_slots/[slotId]/page.tsx
@@ -0,0 +1,10 @@
+import BlockedSlotForm from '@/components/forms/blocked-slot-form';
+
+export default async function NewBlockedSlotPage({
+  params,
+}: {
+  params: Promise<{ slotId?: string }>;
+}) {
+  const resolvedParams = await params;
+  return <BlockedSlotForm existingBlockedSlotId={resolvedParams.slotId} />;
+}
diff --git a/src/app/(main)/blocked_slots/new/page.tsx b/src/app/(main)/blocked_slots/new/page.tsx
new file mode 100644
index 0000000..a7c1bc7
--- /dev/null
+++ b/src/app/(main)/blocked_slots/new/page.tsx
@@ -0,0 +1,5 @@
+import BlockedSlotForm from '@/components/forms/blocked-slot-form';
+
+export default function NewBlockedSlotPage() {
+  return <BlockedSlotForm />;
+}
diff --git a/src/app/(main)/blocked_slots/page.tsx b/src/app/(main)/blocked_slots/page.tsx
new file mode 100644
index 0000000..2331737
--- /dev/null
+++ b/src/app/(main)/blocked_slots/page.tsx
@@ -0,0 +1,56 @@
+'use client';
+
+import { RedirectButton } from '@/components/buttons/redirect-button';
+import BlockedSlotListEntry from '@/components/custom-ui/blocked-slot-list-entry';
+import { Label } from '@/components/ui/label';
+import { useGetApiBlockedSlots } from '@/generated/api/blocked-slots/blocked-slots';
+
+export default function BlockedSlots() {
+  const { data: blockedSlotsData, isLoading, error } = useGetApiBlockedSlots();
+
+  if (isLoading) return <div className='text-center mt-10'>Loading...</div>;
+  if (error)
+    return (
+      <div className='text-center mt-10 text-red-500'>
+        Error loading blocked slots
+      </div>
+    );
+
+  const blockedSlots = blockedSlotsData?.data?.blocked_slots || [];
+
+  return (
+    <div className='relative h-full flex flex-col items-center'>
+      {/* Heading */}
+      <h1 className='text-3xl font-bold mt-8 mb-4 text-center z-10'>
+        My Blocked Slots
+      </h1>
+
+      {/* Scrollable blocked slot list */}
+      <div className='w-full flex justify-center overflow-hidden'>
+        <div className='grid gap-8 w-[max(90%, 500px)] p-6 overflow-y-auto'>
+          {blockedSlots.length > 0 ? (
+            blockedSlots.map((slot) => (
+              <BlockedSlotListEntry
+                key={slot.id}
+                {...slot}
+                updated_at={new Date(slot.updated_at)}
+                created_at={new Date(slot.created_at)}
+              />
+            ))
+          ) : (
+            <div className='flex flex-1 flex-col items-center justify-center min-h-[300px]'>
+              <Label size='large' className='justify-center text-center'>
+                You don&#39;t have any blocked slots right now
+              </Label>
+              <RedirectButton
+                redirectUrl='/blocked_slots/new'
+                buttonText='create Blocked Slot'
+                className='mt-4'
+              />
+            </div>
+          )}
+        </div>
+      </div>
+    </div>
+  );
+}
diff --git a/src/app/(main)/events/[eventID]/page.tsx b/src/app/(main)/events/[eventID]/page.tsx
index c11e028..ce39d19 100644
--- a/src/app/(main)/events/[eventID]/page.tsx
+++ b/src/app/(main)/events/[eventID]/page.tsx
@@ -155,7 +155,11 @@ export default function ShowEvent() {
                   </Label>{' '}
                   <div className='grid grid-cols-1 mt-3 sm:max-h-60 sm:grid-cols-2  sm:overflow-y-auto sm:mb-0'>
                     {event.participants?.map((user) => (
-                      <ParticipantListEntry key={user.user.id} {...user} />
+                      <ParticipantListEntry
+                        key={user.user.id}
+                        {...user}
+                        eventID={event.id}
+                      />
                     ))}
                   </div>
                 </div>
diff --git a/src/app/api/blocked_slots/[slotID]/route.ts b/src/app/api/blocked_slots/[slotID]/route.ts
new file mode 100644
index 0000000..908324e
--- /dev/null
+++ b/src/app/api/blocked_slots/[slotID]/route.ts
@@ -0,0 +1,165 @@
+import { auth } from '@/auth';
+import { prisma } from '@/prisma';
+import {
+  returnZodTypeCheckedResponse,
+  userAuthenticated,
+} from '@/lib/apiHelpers';
+import {
+  updateBlockedSlotSchema,
+  BlockedSlotResponseSchema,
+} from '@/app/api/blocked_slots/validation';
+import {
+  ErrorResponseSchema,
+  SuccessResponseSchema,
+  ZodErrorResponseSchema,
+} from '@/app/api/validation';
+
+export const GET = auth(async function GET(req, { params }) {
+  const authCheck = userAuthenticated(req);
+  if (!authCheck.continue)
+    return returnZodTypeCheckedResponse(
+      ErrorResponseSchema,
+      authCheck.response,
+      authCheck.metadata,
+    );
+
+  const slotID = (await params).slotID;
+
+  const blockedSlot = await prisma.blockedSlot.findUnique({
+    where: {
+      id: slotID,
+      user_id: authCheck.user.id,
+    },
+    select: {
+      id: true,
+      start_time: true,
+      end_time: true,
+      reason: true,
+      created_at: true,
+      updated_at: true,
+      is_recurring: true,
+      recurrence_end_date: true,
+      rrule: true,
+    },
+  });
+
+  if (!blockedSlot) {
+    return returnZodTypeCheckedResponse(
+      ErrorResponseSchema,
+      {
+        success: false,
+        message: 'Blocked slot not found or not owned by user',
+      },
+      { status: 404 },
+    );
+  }
+
+  return returnZodTypeCheckedResponse(
+    BlockedSlotResponseSchema,
+    {
+      blocked_slot: blockedSlot,
+    },
+    {
+      status: 200,
+    },
+  );
+});
+
+export const PATCH = auth(async function PATCH(req, { params }) {
+  const authCheck = userAuthenticated(req);
+  if (!authCheck.continue)
+    return returnZodTypeCheckedResponse(
+      ErrorResponseSchema,
+      authCheck.response,
+      authCheck.metadata,
+    );
+
+  const slotID = (await params).slotID;
+
+  const dataRaw = await req.json();
+  const data = await updateBlockedSlotSchema.safeParseAsync(dataRaw);
+  if (!data.success)
+    return returnZodTypeCheckedResponse(
+      ZodErrorResponseSchema,
+      {
+        success: false,
+        message: 'Invalid request data',
+        errors: data.error.issues,
+      },
+      { status: 400 },
+    );
+
+  const blockedSlot = await prisma.blockedSlot.update({
+    where: {
+      id: slotID,
+      user_id: authCheck.user.id,
+    },
+    data: data.data,
+    select: {
+      id: true,
+      start_time: true,
+      end_time: true,
+      reason: true,
+      created_at: true,
+      updated_at: true,
+      is_recurring: true,
+      recurrence_end_date: true,
+      rrule: true,
+    },
+  });
+
+  if (!blockedSlot) {
+    return returnZodTypeCheckedResponse(
+      ErrorResponseSchema,
+      {
+        success: false,
+        message: 'Blocked slot not found or not owned by user',
+      },
+      { status: 404 },
+    );
+  }
+
+  return returnZodTypeCheckedResponse(
+    BlockedSlotResponseSchema,
+    { success: true, blocked_slot: blockedSlot },
+    { status: 200 },
+  );
+});
+
+export const DELETE = auth(async function DELETE(req, { params }) {
+  const authCheck = userAuthenticated(req);
+  if (!authCheck.continue)
+    return returnZodTypeCheckedResponse(
+      ErrorResponseSchema,
+      authCheck.response,
+      authCheck.metadata,
+    );
+
+  const slotID = (await params).slotID;
+
+  const deletedSlot = await prisma.blockedSlot.delete({
+    where: {
+      id: slotID,
+      user_id: authCheck.user.id,
+    },
+  });
+
+  if (!deletedSlot) {
+    return returnZodTypeCheckedResponse(
+      ErrorResponseSchema,
+      {
+        success: false,
+        message: 'Blocked slot not found or not owned by user',
+      },
+      { status: 404 },
+    );
+  }
+
+  return returnZodTypeCheckedResponse(
+    SuccessResponseSchema,
+    { success: true },
+    {
+      status: 200,
+    },
+  );
+});
diff --git a/src/app/api/blocked_slots/[slotID]/swagger.ts b/src/app/api/blocked_slots/[slotID]/swagger.ts
new file mode 100644
index 0000000..16f2637
--- /dev/null
+++ b/src/app/api/blocked_slots/[slotID]/swagger.ts
@@ -0,0 +1,90 @@
+import {
+  updateBlockedSlotSchema,
+  BlockedSlotResponseSchema,
+} from '@/app/api/blocked_slots/validation';
+import {
+  notAuthenticatedResponse,
+  serverReturnedDataValidationErrorResponse,
+  userNotFoundResponse,
+  invalidRequestDataResponse,
+} from '@/lib/defaultApiResponses';
+import { OpenAPIRegistry } from '@asteasolutions/zod-to-openapi';
+import { SlotIdParamSchema } from '@/app/api/validation';
+import zod from 'zod/v4';
+
+export default function registerSwaggerPaths(registry: OpenAPIRegistry) {
+  registry.registerPath({
+    method: 'get',
+    path: '/api/blocked_slots/{slotID}',
+    request: {
+      params: zod.object({
+        slotID: SlotIdParamSchema,
+      }),
+    },
+    responses: {
+      200: {
+        description: 'Blocked slot retrieved successfully',
+        content: {
+          'application/json': {
+            schema: BlockedSlotResponseSchema,
+          },
+        },
+      },
+      ...userNotFoundResponse,
+      ...notAuthenticatedResponse,
+      ...serverReturnedDataValidationErrorResponse,
+    },
+    tags: ['Blocked Slots'],
+  });
+
+  registry.registerPath({
+    method: 'delete',
+    path: '/api/blocked_slots/{slotID}',
+    request: {
+      params: zod.object({
+        slotID: SlotIdParamSchema,
+      }),
+    },
+    responses: {
+      204: {
+        description: 'Blocked slot deleted successfully',
+      },
+      ...userNotFoundResponse,
+      ...notAuthenticatedResponse,
+      ...serverReturnedDataValidationErrorResponse,
+    },
+    tags: ['Blocked Slots'],
+  });
+
+  registry.registerPath({
+    method: 'patch',
+    path: '/api/blocked_slots/{slotID}',
+    request: {
+      params: zod.object({
+        slotID: SlotIdParamSchema,
+      }),
+      body: {
+        content: {
+          'application/json': {
+            schema: updateBlockedSlotSchema,
+          },
+        },
+      },
+    },
+    responses: {
+      200: {
+        description: 'Blocked slot updated successfully',
+        content: {
+          'application/json': {
+            schema: BlockedSlotResponseSchema,
+          },
+        },
+      },
+      ...userNotFoundResponse,
+      ...notAuthenticatedResponse,
+      ...serverReturnedDataValidationErrorResponse,
+      ...invalidRequestDataResponse,
+    },
+    tags: ['Blocked Slots'],
+  });
+}
diff --git a/src/app/api/blocked_slots/route.ts b/src/app/api/blocked_slots/route.ts
new file mode 100644
index 0000000..afd4f87
--- /dev/null
+++ b/src/app/api/blocked_slots/route.ts
@@ -0,0 +1,127 @@
+import { auth } from '@/auth';
+import { prisma } from '@/prisma';
+import {
+  returnZodTypeCheckedResponse,
+  userAuthenticated,
+} from '@/lib/apiHelpers';
+import {
+  blockedSlotsQuerySchema,
+  BlockedSlotsResponseSchema,
+  BlockedSlotsSchema,
+  createBlockedSlotSchema,
+} from './validation';
+import {
+  ErrorResponseSchema,
+  ZodErrorResponseSchema,
+} from '@/app/api/validation';
+
+export const GET = auth(async function GET(req) {
+  const authCheck = userAuthenticated(req);
+  if (!authCheck.continue)
+    return returnZodTypeCheckedResponse(
+      ErrorResponseSchema,
+      authCheck.response,
+      authCheck.metadata,
+    );
+
+  const dataRaw: Record<string, string | string[]> = {};
+  for (const [key, value] of req.nextUrl.searchParams.entries()) {
+    if (key.endsWith('[]')) {
+      const cleanKey = key.slice(0, -2);
+      if (!dataRaw[cleanKey]) {
+        dataRaw[cleanKey] = [];
+      }
+      if (Array.isArray(dataRaw[cleanKey])) {
+        (dataRaw[cleanKey] as string[]).push(value);
+      } else {
+        dataRaw[cleanKey] = [dataRaw[cleanKey] as string, value];
+      }
+    } else {
+      dataRaw[key] = value;
+    }
+  }
+  const data = await blockedSlotsQuerySchema.safeParseAsync(dataRaw);
+  if (!data.success)
+    return returnZodTypeCheckedResponse(
+      ZodErrorResponseSchema,
+      {
+        success: false,
+        message: 'Invalid request data',
+        errors: data.error.issues,
+      },
+      { status: 400 },
+    );
+  const { start, end } = data.data;
+
+  const requestUserId = authCheck.user.id;
+
+  const blockedSlots = await prisma.blockedSlot.findMany({
+    where: {
+      user_id: requestUserId,
+      start_time: { gte: start },
+      end_time: { lte: end },
+    },
+    orderBy: { start_time: 'asc' },
+    select: {
+      id: true,
+      start_time: true,
+      end_time: true,
+      reason: true,
+      created_at: true,
+      updated_at: true,
+    },
+  });
+
+  return returnZodTypeCheckedResponse(
+    BlockedSlotsResponseSchema,
+    { success: true, blocked_slots: blockedSlots },
+    { status: 200 },
+  );
+});
+
+export const POST = auth(async function POST(req) {
+  const authCheck = userAuthenticated(req);
+  if (!authCheck.continue)
+    return returnZodTypeCheckedResponse(
+      ErrorResponseSchema,
+      authCheck.response,
+      authCheck.metadata,
+    );
+
+  const dataRaw = await req.json();
+  const data = await createBlockedSlotSchema.safeParseAsync(dataRaw);
+  if (!data.success)
+    return returnZodTypeCheckedResponse(
+      ZodErrorResponseSchema,
+      {
+        success: false,
+        message: 'Invalid request data',
+        errors: data.error.issues,
+      },
+      { status: 400 },
+    );
+
+  const requestUserId = authCheck.user.id;
+
+  if (!requestUserId) {
+    return returnZodTypeCheckedResponse(
+      ErrorResponseSchema,
+      {
+        success: false,
+        message: 'User not authenticated',
+      },
+      { status: 401 },
+    );
+  }
+
+  const blockedSlot = await prisma.blockedSlot.create({
+    data: {
+      ...data.data,
+      user_id: requestUserId,
+    },
+  });
+
+  return returnZodTypeCheckedResponse(BlockedSlotsSchema, blockedSlot, {
+    status: 201,
+  });
+});
diff --git a/src/app/api/blocked_slots/swagger.ts b/src/app/api/blocked_slots/swagger.ts
new file mode 100644
index 0000000..4be89a9
--- /dev/null
+++ b/src/app/api/blocked_slots/swagger.ts
@@ -0,0 +1,66 @@
+import {
+  BlockedSlotResponseSchema,
+  BlockedSlotsResponseSchema,
+  blockedSlotsQuerySchema,
+  createBlockedSlotSchema,
+} from './validation';
+import {
+  invalidRequestDataResponse,
+  notAuthenticatedResponse,
+  serverReturnedDataValidationErrorResponse,
+  userNotFoundResponse,
+} from '@/lib/defaultApiResponses';
+import { OpenAPIRegistry } from '@asteasolutions/zod-to-openapi';
+
+export default function registerSwaggerPaths(registry: OpenAPIRegistry) {
+  registry.registerPath({
+    method: 'get',
+    path: '/api/blocked_slots',
+    request: {
+      query: blockedSlotsQuerySchema,
+    },
+    responses: {
+      200: {
+        description: 'Blocked slots retrieved successfully.',
+        content: {
+          'application/json': {
+            schema: BlockedSlotsResponseSchema,
+          },
+        },
+      },
+      ...notAuthenticatedResponse,
+      ...userNotFoundResponse,
+      ...serverReturnedDataValidationErrorResponse,
+    },
+    tags: ['Blocked Slots'],
+  });
+
+  registry.registerPath({
+    method: 'post',
+    path: '/api/blocked_slots',
+    request: {
+      body: {
+        content: {
+          'application/json': {
+            schema: createBlockedSlotSchema,
+          },
+        },
+      },
+    },
+    responses: {
+      201: {
+        description: 'Blocked slot created successfully.',
+        content: {
+          'application/json': {
+            schema: BlockedSlotResponseSchema,
+          },
+        },
+      },
+      ...notAuthenticatedResponse,
+      ...userNotFoundResponse,
+      ...serverReturnedDataValidationErrorResponse,
+      ...invalidRequestDataResponse,
+    },
+    tags: ['Blocked Slots'],
+  });
+}
diff --git a/src/app/api/blocked_slots/validation.ts b/src/app/api/blocked_slots/validation.ts
new file mode 100644
index 0000000..d761700
--- /dev/null
+++ b/src/app/api/blocked_slots/validation.ts
@@ -0,0 +1,52 @@
+import { extendZodWithOpenApi } from '@asteasolutions/zod-to-openapi';
+import zod from 'zod/v4';
+import {
+  eventEndTimeSchema,
+  eventStartTimeSchema,
+} from '@/app/api/event/validation';
+
+extendZodWithOpenApi(zod);
+
+export const blockedSlotsQuerySchema = zod.object({
+  start: eventStartTimeSchema.optional(),
+  end: eventEndTimeSchema.optional(),
+});
+
+export const blockedSlotRecurrenceEndDateSchema = zod.iso
+  .datetime()
+  .or(zod.date().transform((date) => date.toISOString()));
+
+export const BlockedSlotsSchema = zod
+  .object({
+    start_time: eventStartTimeSchema,
+    end_time: eventEndTimeSchema,
+    id: zod.string(),
+    reason: zod.string().nullish(),
+    created_at: zod.date(),
+    updated_at: zod.date(),
+  })
+  .openapi('BlockedSlotsSchema', {
+    description: 'Blocked time slot in the user calendar',
+  });
+
+export const BlockedSlotsResponseSchema = zod.object({
+  success: zod.boolean().default(true),
+  blocked_slots: zod.array(BlockedSlotsSchema),
+});
+
+export const BlockedSlotResponseSchema = zod.object({
+  success: zod.boolean().default(true),
+  blocked_slot: BlockedSlotsSchema,
+});
+
+export const createBlockedSlotSchema = BlockedSlotsSchema.omit({
+  id: true,
+  created_at: true,
+  updated_at: true,
+});
+
+export const updateBlockedSlotSchema = zod.object({
+  start_time: eventStartTimeSchema.optional(),
+  end_time: eventEndTimeSchema.optional(),
+  reason: zod.string().optional(),
+});
diff --git a/src/app/api/calendar/validation.ts b/src/app/api/calendar/validation.ts
index 5bf45a6..bc51489 100644
--- a/src/app/api/calendar/validation.ts
+++ b/src/app/api/calendar/validation.ts
@@ -48,6 +48,7 @@ export const VisibleSlotSchema = EventSchema.omit({
     type: zod.literal('event'),
     users: zod.string().array(),
     user_id: zod.string().optional(),
+    organizer_id: zod.string().optional(),
   })
   .openapi('VisibleSlotSchema', {
     description: 'Visible time slot in the user calendar',
diff --git a/src/app/api/validation.ts b/src/app/api/validation.ts
index 38b95bd..518121d 100644
--- a/src/app/api/validation.ts
+++ b/src/app/api/validation.ts
@@ -85,3 +85,14 @@ export const EventIdParamSchema = registry.registerParameter(
     example: '67890',
   }),
 );
+
+export const SlotIdParamSchema = registry.registerParameter(
+  'SlotIdParam',
+  zod.string().openapi({
+    param: {
+      name: 'slotID',
+      in: 'path',
+    },
+    example: 'abcde12345',
+  }),
+);
diff --git a/src/components/calendar.tsx b/src/components/calendar.tsx
index ab23c35..56885e0 100644
--- a/src/components/calendar.tsx
+++ b/src/components/calendar.tsx
@@ -17,6 +17,7 @@ import { Button } from '@/components/ui/button';
 import { fromZodIssue } from 'zod-validation-error/v4';
 import type { $ZodIssue } from 'zod/v4/core';
 import { useGetApiCalendar } from '@/generated/api/calendar/calendar';
+import { usePatchApiBlockedSlotsSlotID } from '@/generated/api/blocked-slots/blocked-slots';
 
 moment.updateLocale('en', {
   week: {
@@ -47,6 +48,7 @@ const DaDRBCalendar = withDragAndDrop<
     end: Date;
     type: UserCalendarSchemaItem['type'];
     userId?: string;
+    organizer?: string;
   },
   {
     id: string;
@@ -190,6 +192,13 @@ function CalendarWithUserEvents({
       },
     },
   });
+  const { mutate: patchBlockedSlot } = usePatchApiBlockedSlotsSlotID({
+    mutation: {
+      throwOnError(error) {
+        throw error.response?.data || 'Failed to update blocked slot';
+      },
+    },
+  });
 
   return (
     <DaDRBCalendar
@@ -218,11 +227,19 @@ function CalendarWithUserEvents({
           end: new Date(event.end_time),
           type: event.type,
           userId: event.users[0],
+          organizer: event.type === 'event' ? event.organizer_id : undefined,
         })) ?? []),
         ...(additionalEvents ?? []),
       ]}
       onSelectEvent={(event) => {
-        router.push(`/events/${event.id}`);
+        if (event.type === 'blocked_private') return;
+        if (event.type === 'blocked_owned') {
+          router.push(`/blocked_slots/${event.id}`);
+          return;
+        }
+        if (event.type === 'event') {
+          router.push(`/events/${event.id}`);
+        }
       }}
       onSelectSlot={(slotInfo) => {
         router.push(
@@ -236,53 +253,105 @@ function CalendarWithUserEvents({
       selectable={sesstion.data?.user?.id === userId}
       onEventDrop={(event) => {
         const { start, end, event: droppedEvent } = event;
-        if (droppedEvent.type === 'blocked_private') return;
+        if (
+          droppedEvent.type === 'blocked_private' ||
+          (droppedEvent.organizer &&
+            droppedEvent.organizer !== sesstion.data?.user?.id)
+        )
+          return;
         const startISO = new Date(start).toISOString();
         const endISO = new Date(end).toISOString();
-        patchEvent(
-          {
-            eventID: droppedEvent.id,
-            data: {
-              start_time: startISO,
-              end_time: endISO,
+        if (droppedEvent.type === 'blocked_owned') {
+          patchBlockedSlot(
+            {
+              slotID: droppedEvent.id,
+              data: {
+                start_time: startISO,
+                end_time: endISO,
+              },
             },
-          },
-          {
-            onSuccess: () => {
-              refetch();
+            {
+              onSuccess: () => {
+                refetch();
+              },
+              onError: (error) => {
+                console.error('Error updating blocked slot:', error);
+              },
             },
-            onError: (error) => {
-              console.error('Error updating event:', error);
+          );
+          return;
+        } else if (droppedEvent.type === 'event') {
+          patchEvent(
+            {
+              eventID: droppedEvent.id,
+              data: {
+                start_time: startISO,
+                end_time: endISO,
+              },
             },
-          },
-        );
+            {
+              onSuccess: () => {
+                refetch();
+              },
+              onError: (error) => {
+                console.error('Error updating event:', error);
+              },
+            },
+          );
+        }
       }}
       onEventResize={(event) => {
         const { start, end, event: resizedEvent } = event;
-        if (resizedEvent.type === 'blocked_private') return;
+        if (
+          resizedEvent.type === 'blocked_private' ||
+          (resizedEvent.organizer &&
+            resizedEvent.organizer !== sesstion.data?.user?.id)
+        )
+          return;
         const startISO = new Date(start).toISOString();
         const endISO = new Date(end).toISOString();
         if (startISO === endISO) {
           console.warn('Start and end times are the same, skipping resize.');
           return;
         }
-        patchEvent(
-          {
-            eventID: resizedEvent.id,
-            data: {
-              start_time: startISO,
-              end_time: endISO,
+        if (resizedEvent.type === 'blocked_owned') {
+          patchBlockedSlot(
+            {
+              slotID: resizedEvent.id,
+              data: {
+                start_time: startISO,
+                end_time: endISO,
+              },
             },
-          },
-          {
-            onSuccess: () => {
-              refetch();
+            {
+              onSuccess: () => {
+                refetch();
+              },
+              onError: (error) => {
+                console.error('Error resizing blocked slot:', error);
+              },
             },
-            onError: (error) => {
-              console.error('Error resizing event:', error);
+          );
+          return;
+        } else if (resizedEvent.type === 'event') {
+          patchEvent(
+            {
+              eventID: resizedEvent.id,
+              data: {
+                start_time: startISO,
+                end_time: endISO,
+              },
             },
-          },
-        );
+            {
+              onSuccess: () => {
+                refetch();
+              },
+              onError: (error) => {
+                console.error('Error resizing event:', error);
+              },
+            },
+          );
+        }
       }}
     />
   );
diff --git a/src/components/custom-ui/app-sidebar.tsx b/src/components/custom-ui/app-sidebar.tsx
index 50e88c2..ec3c77f 100644
--- a/src/components/custom-ui/app-sidebar.tsx
+++ b/src/components/custom-ui/app-sidebar.tsx
@@ -14,7 +14,7 @@ import {
   SidebarMenuItem,
 } from '@/components/custom-ui/sidebar';
 
-import { ChevronDown } from 'lucide-react';
+import { CalendarMinus, ChevronDown } from 'lucide-react';
 import {
   Collapsible,
   CollapsibleContent,
@@ -28,8 +28,8 @@ import Link from 'next/link';
 import {
   Star,
   CalendarDays,
-  User,
-  Users,
+  //User,
+  //Users,
   CalendarClock,
   CalendarPlus,
 } from 'lucide-react';
@@ -40,7 +40,7 @@ const items = [
     url: '/home',
     icon: CalendarDays,
   },
-  {
+  /*{
     title: 'Friends',
     url: '#',
     icon: User,
@@ -49,12 +49,17 @@ const items = [
     title: 'Groups',
     url: '#',
     icon: Users,
-  },
+  },*/
   {
     title: 'Events',
     url: '/events',
     icon: CalendarClock,
   },
+  {
+    title: 'Blocked Slots',
+    url: '/blocked_slots',
+    icon: CalendarMinus,
+  },
 ];
 
 export function AppSidebar() {
@@ -112,6 +117,17 @@ export function AppSidebar() {
           </SidebarGroupContent>
 
           <SidebarFooter>
+            <SidebarMenuItem className='pl-[8px]'>
+              <Link
+                href='/blocked_slots/new'
+                className='flex items-center gap-2 text-xl font-label'
+              >
+                <CalendarPlus className='size-8' />
+                <span className='group-data-[collapsible=icon]:hidden text-nowrap whitespace-nowrap'>
+                  New Blocked Slot
+                </span>
+              </Link>
+            </SidebarMenuItem>
             <SidebarMenuItem className='pl-[8px]'>
               <Link
                 href='/events/new'
diff --git a/src/components/custom-ui/blocked-slot-list-entry.tsx b/src/components/custom-ui/blocked-slot-list-entry.tsx
new file mode 100644
index 0000000..4690eea
--- /dev/null
+++ b/src/components/custom-ui/blocked-slot-list-entry.tsx
@@ -0,0 +1,56 @@
+'use client';
+
+import { Card } from '@/components/ui/card';
+import Logo from '@/components/misc/logo';
+import { Label } from '@/components/ui/label';
+import Link from 'next/link';
+import zod from 'zod/v4';
+import { BlockedSlotsSchema } from '@/app/api/blocked_slots/validation';
+
+type BlockedSlotListEntryProps = zod.output<typeof BlockedSlotsSchema>;
+
+export default function BlockedSlotListEntry(slot: BlockedSlotListEntryProps) {
+  const formatDate = (isoString?: string) => {
+    if (!isoString) return '-';
+    return new Date(isoString).toLocaleDateString();
+  };
+  const formatTime = (isoString?: string) => {
+    if (!isoString) return '-';
+    return new Date(isoString).toLocaleTimeString([], {
+      hour: '2-digit',
+      minute: '2-digit',
+    });
+  };
+  return (
+    <Link href={`/blocked_slots/${slot.id}`} className='block'>
+      <Card className='w-full'>
+        <div className='grid grid-cols-1 gap-2 mx-auto md:mx-4 md:grid-cols-[80px_1fr_250px]'>
+          <div className='w-full items-center justify-center grid'>
+            <Logo colorType='monochrome' logoType='submark' width={50} />
+          </div>
+          <div className='w-full items-center justify-center grid my-3 md:my-0'>
+            <h2 className='text-center'>{slot.reason}</h2>
+          </div>
+          <div className='grid gap-4'>
+            <div className='grid grid-cols-[80px_auto] gap-2'>
+              <Label className='text-[var(--color-neutral-300)] justify-end'>
+                start
+              </Label>
+              <Label>
+                {formatDate(slot.start_time)} {formatTime(slot.start_time)}
+              </Label>
+            </div>
+            <div className='grid grid-cols-[80px_auto] gap-2'>
+              <Label className='text-[var(--color-neutral-300)] justify-end'>
+                end
+              </Label>
+              <Label>
+                {formatDate(slot.end_time)} {formatTime(slot.end_time)}
+              </Label>
+            </div>
+          </div>
+        </div>
+      </Card>
+    </Link>
+  );
+}
diff --git a/src/components/custom-ui/labeled-input.tsx b/src/components/custom-ui/labeled-input.tsx
index 4746a31..8adb8a5 100644
--- a/src/components/custom-ui/labeled-input.tsx
+++ b/src/components/custom-ui/labeled-input.tsx
@@ -12,7 +12,6 @@ export default function LabeledInput({
   error,
   ...rest
 }: {
-  type: 'text' | 'email' | 'password';
   label: string;
   placeholder?: string;
   value?: string;
diff --git a/src/components/custom-ui/participant-list-entry.tsx b/src/components/custom-ui/participant-list-entry.tsx
index 2ec9c02..6f21ee2 100644
--- a/src/components/custom-ui/participant-list-entry.tsx
+++ b/src/components/custom-ui/participant-list-entry.tsx
@@ -5,16 +5,28 @@ import { user_default_light } from '@/assets/usericon/default/defaultusericon-ex
 import { useTheme } from 'next-themes';
 import zod from 'zod/v4';
 import { ParticipantSchema } from '@/app/api/event/[eventID]/participant/validation';
+import { usePatchApiEventEventIDParticipantUser } from '@/generated/api/event-participant/event-participant';
+import { useSession } from 'next-auth/react';
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from '../ui/select';
 
 type ParticipantListEntryProps = zod.output<typeof ParticipantSchema>;
 
 export default function ParticipantListEntry({
   user,
   status,
-}: ParticipantListEntryProps) {
+  eventID,
+}: ParticipantListEntryProps & { eventID?: string }) {
+  const session = useSession();
   const { resolvedTheme } = useTheme();
   const defaultImage =
     resolvedTheme === 'dark' ? user_default_dark : user_default_light;
+  const updateAttendance = usePatchApiEventEventIDParticipantUser();
 
   const finalImageSrc = user.image ?? defaultImage;
 
@@ -22,7 +34,38 @@ export default function ParticipantListEntry({
     <div className='flex items-center gap-2 py-1 ml-5'>
       <Image src={finalImageSrc} alt='Avatar' width={30} height={30} />
       <span>{user.name}</span>
-      <span className='text-sm text-gray-500'>{status}</span>
+      {user.id === session.data?.user?.id && eventID ? (
+        <Select
+          defaultValue={status}
+          onValueChange={(value) => {
+            updateAttendance.mutate({
+              eventID: eventID,
+              user: session.data?.user?.id || '',
+              data: {
+                status: value as
+                  | 'ACCEPTED'
+                  | 'TENTATIVE'
+                  | 'DECLINED'
+                  | 'PENDING',
+              },
+            });
+          }}
+        >
+          <SelectTrigger id='language'>
+            <SelectValue placeholder='Select status' />
+          </SelectTrigger>
+          <SelectContent>
+            <SelectItem value='ACCEPTED'>Attending</SelectItem>
+            <SelectItem value='TENTATIVE'>Maybe Attending</SelectItem>
+            <SelectItem value='DECLINED'>Not Attending</SelectItem>
+            <SelectItem value='PENDING' disabled>
+              Pending Response
+            </SelectItem>
+          </SelectContent>
+        </Select>
+      ) : (
+        <span className='text-sm text-gray-500'>{status}</span>
+      )}
     </div>
   );
 }
diff --git a/src/components/forms/blocked-slot-form.tsx b/src/components/forms/blocked-slot-form.tsx
new file mode 100644
index 0000000..c6ed109
--- /dev/null
+++ b/src/components/forms/blocked-slot-form.tsx
@@ -0,0 +1,248 @@
+'use client';
+
+import useZodForm from '@/lib/hooks/useZodForm';
+import {
+  updateBlockedSlotSchema,
+  createBlockedSlotSchema,
+} from '@/app/api/blocked_slots/validation';
+import {
+  useGetApiBlockedSlotsSlotID,
+  usePatchApiBlockedSlotsSlotID,
+  useDeleteApiBlockedSlotsSlotID,
+  usePostApiBlockedSlots,
+} from '@/generated/api/blocked-slots/blocked-slots';
+import { useRouter } from 'next/navigation';
+import React from 'react';
+import LabeledInput from '../custom-ui/labeled-input';
+import { Button } from '../ui/button';
+import { Card, CardContent, CardHeader } from '../ui/card';
+import Logo from '../misc/logo';
+import { eventStartTimeSchema } from '@/app/api/event/validation';
+import zod from 'zod/v4';
+
+const dateForDateTimeInputValue = (date: Date) =>
+  new Date(date.getTime() + new Date().getTimezoneOffset() * -60 * 1000)
+    .toISOString()
+    .slice(0, 19);
+
+export default function BlockedSlotForm({
+  existingBlockedSlotId,
+}: {
+  existingBlockedSlotId?: string;
+}) {
+  const router = useRouter();
+
+  const { data: existingBlockedSlot, isLoading: isLoadingExisting } =
+    useGetApiBlockedSlotsSlotID(existingBlockedSlotId || '');
+
+  const {
+    register: registerCreate,
+    handleSubmit: handleCreateSubmit,
+    formState: formStateCreate,
+    reset: resetCreate,
+  } = useZodForm(
+    createBlockedSlotSchema.extend({
+      start_time: eventStartTimeSchema.or(zod.iso.datetime({ local: true })),
+      end_time: eventStartTimeSchema.or(zod.iso.datetime({ local: true })),
+    }),
+  );
+
+  const {
+    register: registerUpdate,
+    handleSubmit: handleUpdateSubmit,
+    formState: formStateUpdate,
+    reset: resetUpdate,
+    setValue: setValueUpdate,
+  } = useZodForm(
+    updateBlockedSlotSchema.extend({
+      start_time: eventStartTimeSchema.or(zod.iso.datetime({ local: true })),
+      end_time: eventStartTimeSchema.or(zod.iso.datetime({ local: true })),
+    }),
+  );
+
+  const { mutateAsync: updateBlockedSlot } = usePatchApiBlockedSlotsSlotID({
+    mutation: {
+      onSuccess: () => {
+        resetUpdate();
+      },
+    },
+  });
+
+  const { mutateAsync: deleteBlockedSlot } = useDeleteApiBlockedSlotsSlotID({
+    mutation: {
+      onSuccess: () => {
+        router.push('/blocked_slots');
+      },
+    },
+  });
+
+  const { mutateAsync: createBlockedSlot } = usePostApiBlockedSlots({
+    mutation: {
+      onSuccess: () => {
+        resetCreate();
+        router.push('/blocked_slots');
+      },
+    },
+  });
+
+  React.useEffect(() => {
+    if (existingBlockedSlot?.data) {
+      setValueUpdate(
+        'start_time',
+        dateForDateTimeInputValue(
+          new Date(existingBlockedSlot?.data.blocked_slot.start_time),
+        ),
+      );
+      setValueUpdate(
+        'end_time',
+        dateForDateTimeInputValue(
+          new Date(existingBlockedSlot?.data.blocked_slot.end_time),
+        ),
+      );
+      setValueUpdate(
+        'reason',
+        existingBlockedSlot?.data.blocked_slot.reason || '',
+      );
+    }
+  }, [
+    existingBlockedSlot?.data,
+    resetUpdate,
+    setValueUpdate,
+    isLoadingExisting,
+  ]);
+
+  const onUpdateSubmit = handleUpdateSubmit(async (data) => {
+    await updateBlockedSlot(
+      {
+        data: {
+          ...data,
+          start_time: new Date(data.start_time).toISOString(),
+          end_time: new Date(data.end_time).toISOString(),
+        },
+        slotID: existingBlockedSlotId || '',
+      },
+      {
+        onSuccess: () => {
+          router.back();
+        },
+      },
+    );
+  });
+
+  const onDeleteSubmit = async () => {
+    if (existingBlockedSlotId) {
+      await deleteBlockedSlot({ slotID: existingBlockedSlotId });
+    }
+  };
+
+  const onCreateSubmit = handleCreateSubmit(async (data) => {
+    await createBlockedSlot({
+      data: {
+        ...data,
+        start_time: new Date(data.start_time).toISOString(),
+        end_time: new Date(data.end_time).toISOString(),
+      },
+    });
+  });
+
+  return (
+    <div className='flex items-center justify-center h-full'>
+      <Card className='w-[max(80%, 500px)] max-w-screen p-0 gap-0 max-xl:w-[95%] mx-auto'>
+        <CardHeader className='p-0 m-0 gap-0 px-6'>
+          <div className='h-full mt-0 ml-2 mb-16 flex items-center justify-between max-sm:grid max-sm:grid-row-start:auto max-sm:mb-6 max-sm:mt-10 max-sm:ml-0'>
+            <div className='w-[100px] max-sm:w-full max-sm:flex max-sm:justify-center'>
+              <Logo colorType='monochrome' logoType='submark' width={50} />
+            </div>
+            <div className='items-center ml-auto mr-auto max-sm:mb-6 max-sm:w-full max-sm:flex max-sm:justify-center'>
+              <h1 className='text-center'>
+                {existingBlockedSlotId
+                  ? 'Update Blocked Slot'
+                  : 'Create Blocked Slot'}
+              </h1>
+            </div>
+            <div className='w-0 sm:w-[100px]'></div>
+          </div>
+        </CardHeader>
+        <CardContent>
+          <form
+            onSubmit={existingBlockedSlotId ? onUpdateSubmit : onCreateSubmit}
+          >
+            <div className='grid grid-cols-1 gap-4 sm:grid-cols-2 lg:grid-cols-3'>
+              <LabeledInput
+                label='Start Time'
+                type='datetime-local'
+                id='start_time'
+                {...(existingBlockedSlotId
+                  ? registerUpdate('start_time')
+                  : registerCreate('start_time'))}
+                error={
+                  formStateCreate.errors.start_time?.message ||
+                  formStateUpdate.errors.start_time?.message
+                }
+                required
+              />
+              <LabeledInput
+                label='End Time'
+                type='datetime-local'
+                id='end_time'
+                {...(existingBlockedSlotId
+                  ? registerUpdate('end_time')
+                  : registerCreate('end_time'))}
+                error={
+                  formStateCreate.errors.end_time?.message ||
+                  formStateUpdate.errors.end_time?.message
+                }
+                required
+              />
+              <LabeledInput
+                label='Reason'
+                type='text'
+                id='reason'
+                {...(existingBlockedSlotId
+                  ? registerUpdate('reason')
+                  : registerCreate('reason'))}
+                error={
+                  formStateCreate.errors.reason?.message ||
+                  formStateUpdate.errors.reason?.message
+                }
+                placeholder='Optional reason for blocking this slot'
+              />
+            </div>
+            <div className='flex justify-end gap-2 p-4'>
+              <Button
+                type='submit'
+                variant='primary'
+                disabled={
+                  formStateCreate.isSubmitting || formStateUpdate.isSubmitting
+                }
+              >
+                {existingBlockedSlotId
+                  ? 'Update Blocked Slot'
+                  : 'Create Blocked Slot'}
+              </Button>
+              {existingBlockedSlotId && (
+                <Button
+                  type='button'
+                  variant='destructive'
+                  onClick={onDeleteSubmit}
+                >
+                  Delete Blocked Slot
+                </Button>
+              )}
+            </div>
+            {formStateCreate.errors.root && (
+              <p className='text-red-500 text-sm mt-1'>
+                {formStateCreate.errors.root.message}
+              </p>
+            )}
+            {formStateUpdate.errors.root && (
+              <p className='text-red-500 text-sm mt-1'>
+                {formStateUpdate.errors.root.message}
+              </p>
+            )}
+          </form>
+        </CardContent>
+      </Card>
+    </div>
+  );
+}
diff --git a/src/components/wrappers/query-provider.tsx b/src/components/wrappers/query-provider.tsx
index 4d05c6c..0120caf 100644
--- a/src/components/wrappers/query-provider.tsx
+++ b/src/components/wrappers/query-provider.tsx
@@ -3,7 +3,7 @@
 import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
 import * as React from 'react';
 
-const queryClient = new QueryClient();
+export const queryClient = new QueryClient();
 
 export function QueryProvider({ children }: { children: React.ReactNode }) {
   return (