diff --git a/src/app/api/event/[eventID]/participant/route.ts b/src/app/api/event/[eventID]/participant/route.ts
new file mode 100644
index 0000000..91ce965
--- /dev/null
+++ b/src/app/api/event/[eventID]/participant/route.ts
@@ -0,0 +1,200 @@
+import { prisma } from '@/prisma';
+import { auth } from '@/auth';
+import {
+  returnZodTypeCheckedResponse,
+  userAuthenticated,
+} from '@/lib/apiHelpers';
+import {
+  ErrorResponseSchema,
+  ZodErrorResponseSchema,
+} from '@/app/api/validation';
+import {
+  inviteParticipantSchema,
+  ParticipantResponseSchema,
+  ParticipantsResponseSchema,
+} from './validation';
+
+export const GET = auth(async (req, { params }) => {
+  const authCheck = userAuthenticated(req);
+  if (!authCheck.continue)
+    return returnZodTypeCheckedResponse(
+      ErrorResponseSchema,
+      authCheck.response,
+      authCheck.metadata,
+    );
+
+  const dbUser = await prisma.user.findUnique({
+    where: {
+      id: authCheck.user.id,
+    },
+  });
+
+  if (!dbUser)
+    return returnZodTypeCheckedResponse(
+      ErrorResponseSchema,
+      { success: false, message: 'User not found' },
+      { status: 404 },
+    );
+
+  const eventID = (await params).eventID;
+
+  const isParticipant = await prisma.meetingParticipant.findFirst({
+    where: {
+      meeting_id: eventID,
+      user_id: dbUser.id,
+    },
+    select: {
+      status: true,
+    },
+  });
+
+  const isOrganizer = await prisma.meeting.findFirst({
+    where: {
+      id: eventID,
+      organizer_id: dbUser.id,
+    },
+    select: {
+      id: true,
+    },
+  });
+
+  if (!isParticipant && !isOrganizer)
+    return returnZodTypeCheckedResponse(
+      ErrorResponseSchema,
+      {
+        success: false,
+        message: 'User is not a participant or organizer of this event',
+      },
+      { status: 403 },
+    );
+
+  const participants = await prisma.meetingParticipant.findMany({
+    where: {
+      meeting_id: eventID,
+    },
+    select: {
+      user: {
+        select: {
+          id: true,
+          name: true,
+          first_name: true,
+          last_name: true,
+          image: true,
+          timezone: true,
+        },
+      },
+      status: true,
+    },
+  });
+
+  return returnZodTypeCheckedResponse(ParticipantsResponseSchema, {
+    success: true,
+    participants,
+  });
+});
+
+export const POST = auth(async (req, { params }) => {
+  const authCheck = userAuthenticated(req);
+  if (!authCheck.continue)
+    return returnZodTypeCheckedResponse(
+      ErrorResponseSchema,
+      authCheck.response,
+      authCheck.metadata,
+    );
+
+  const dbUser = await prisma.user.findUnique({
+    where: {
+      id: authCheck.user.id,
+    },
+  });
+
+  if (!dbUser)
+    return returnZodTypeCheckedResponse(
+      ErrorResponseSchema,
+      { success: false, message: 'User not found' },
+      { status: 404 },
+    );
+
+  const eventID = (await params).eventID;
+
+  const isOrganizer = await prisma.meeting.findFirst({
+    where: {
+      id: eventID,
+      organizer_id: dbUser.id,
+    },
+  });
+
+  if (!isOrganizer)
+    return returnZodTypeCheckedResponse(
+      ErrorResponseSchema,
+      { success: false, message: 'Only organizers can add participants' },
+      { status: 403 },
+    );
+
+  const dataRaw = await req.json();
+  const data = await inviteParticipantSchema.safeParseAsync(dataRaw);
+  if (!data.success) {
+    return returnZodTypeCheckedResponse(
+      ZodErrorResponseSchema,
+      {
+        success: false,
+        message: 'Invalid request data',
+        errors: data.error.issues,
+      },
+      { status: 400 },
+    );
+  }
+  const { user_id } = data.data;
+
+  const participantExists = await prisma.meetingParticipant.findFirst({
+    where: {
+      meeting_id: eventID,
+      user_id,
+    },
+  });
+
+  if (participantExists)
+    return returnZodTypeCheckedResponse(
+      ErrorResponseSchema,
+      {
+        success: false,
+        message: 'User is already a participant of this event',
+      },
+      { status: 409 },
+    );
+
+  const newParticipant = await prisma.meetingParticipant.create({
+    data: {
+      meeting_id: eventID,
+      user_id,
+    },
+    select: {
+      user: {
+        select: {
+          id: true,
+          name: true,
+          first_name: true,
+          last_name: true,
+          image: true,
+          timezone: true,
+        },
+      },
+      status: true,
+    },
+  });
+
+  return returnZodTypeCheckedResponse(ParticipantResponseSchema, {
+    success: true,
+    participant: {
+      user: {
+        id: newParticipant.user.id,
+        name: newParticipant.user.name,
+        first_name: newParticipant.user.first_name,
+        last_name: newParticipant.user.last_name,
+        image: newParticipant.user.image,
+        timezone: newParticipant.user.timezone,
+      },
+      status: newParticipant.status,
+    },
+  });
+});
diff --git a/src/app/api/event/[eventID]/participant/swagger.ts b/src/app/api/event/[eventID]/participant/swagger.ts
new file mode 100644
index 0000000..38dfd58
--- /dev/null
+++ b/src/app/api/event/[eventID]/participant/swagger.ts
@@ -0,0 +1,72 @@
+import { OpenAPIRegistry } from '@asteasolutions/zod-to-openapi';
+import zod from 'zod/v4';
+import {
+  ParticipantsResponseSchema,
+  ParticipantResponseSchema,
+  inviteParticipantSchema,
+} from './validation';
+import {
+  invalidRequestDataResponse,
+  notAuthenticatedResponse,
+  serverReturnedDataValidationErrorResponse,
+  userNotFoundResponse,
+} from '@/lib/defaultApiResponses';
+import { EventIdParamSchema } from '@/app/api/validation';
+
+export default function registerSwaggerPaths(registry: OpenAPIRegistry) {
+  registry.registerPath({
+    method: 'get',
+    path: '/api/event/{eventID}/participant',
+    request: {
+      params: zod.object({
+        eventID: EventIdParamSchema,
+      }),
+    },
+    responses: {
+      200: {
+        description: 'List participants for the event',
+        content: {
+          'application/json': {
+            schema: ParticipantsResponseSchema,
+          },
+        },
+      },
+      ...notAuthenticatedResponse,
+      ...userNotFoundResponse,
+      ...serverReturnedDataValidationErrorResponse,
+    },
+    tags: ['Event Participant'],
+  });
+
+  registry.registerPath({
+    method: 'post',
+    path: '/api/event/{eventID}/participant',
+    request: {
+      params: zod.object({
+        eventID: EventIdParamSchema,
+      }),
+      body: {
+        content: {
+          'application/json': {
+            schema: inviteParticipantSchema,
+          },
+        },
+      },
+    },
+    responses: {
+      200: {
+        description: 'Participant invited successfully',
+        content: {
+          'application/json': {
+            schema: ParticipantResponseSchema,
+          },
+        },
+      },
+      ...invalidRequestDataResponse,
+      ...notAuthenticatedResponse,
+      ...userNotFoundResponse,
+      ...serverReturnedDataValidationErrorResponse,
+    },
+    tags: ['Event Participant'],
+  });
+}
diff --git a/src/app/api/event/[eventID]/participant/validation.ts b/src/app/api/event/[eventID]/participant/validation.ts
new file mode 100644
index 0000000..bacb9ac
--- /dev/null
+++ b/src/app/api/event/[eventID]/participant/validation.ts
@@ -0,0 +1,50 @@
+import { extendZodWithOpenApi } from '@asteasolutions/zod-to-openapi';
+import zod from 'zod/v4';
+import {
+  existingUserIdServerSchema,
+  PublicUserSchema,
+} from '@/app/api/user/validation';
+
+extendZodWithOpenApi(zod);
+
+export const participantStatusSchema = zod.enum([
+  'ACCEPTED',
+  'DECLINED',
+  'TENTATIVE',
+  'PENDING',
+]);
+
+export const inviteParticipantSchema = zod
+  .object({
+    user_id: existingUserIdServerSchema,
+  })
+  .openapi('InviteParticipant', {
+    description: 'Schema for inviting a participant to an event',
+  });
+
+export const updateParticipantSchema = zod
+  .object({
+    status: participantStatusSchema,
+  })
+  .openapi('UpdateParticipant', {
+    description: 'Schema for updating participant status in an event',
+  });
+
+export const ParticipantSchema = zod
+  .object({
+    user: PublicUserSchema,
+    status: participantStatusSchema,
+  })
+  .openapi('Participant', {
+    description: 'Participant information including user and status',
+  });
+
+export const ParticipantResponseSchema = zod.object({
+  success: zod.boolean(),
+  participant: ParticipantSchema,
+});
+
+export const ParticipantsResponseSchema = zod.object({
+  success: zod.boolean(),
+  participants: zod.array(ParticipantSchema),
+});