diff --git a/src/app/api/event/[eventID]/route.ts b/src/app/api/event/[eventID]/route.ts
index 123685b..8c06b64 100644
--- a/src/app/api/event/[eventID]/route.ts
+++ b/src/app/api/event/[eventID]/route.ts
@@ -229,6 +229,23 @@ export const PATCH = auth(async (req, { params }) => {
     participants,
   } = data.data;
 
+  if (participants !== undefined)
+    for (const participant of participants) {
+      await prisma.meetingParticipant.upsert({
+        where: {
+          meeting_id_user_id: {
+            user_id: participant,
+            meeting_id: eventID,
+          },
+        },
+        create: {
+          user_id: participant,
+          meeting_id: eventID,
+        },
+        update: {},
+      });
+    }
+
   const updatedEvent = await prisma.meeting.update({
     where: {
       id: eventID,
@@ -240,18 +257,16 @@ export const PATCH = auth(async (req, { params }) => {
       end_time,
       location,
       status,
-      participants: !participants
-        ? undefined
-        : {
-          deleteMany: {
-            user_id: {
-              notIn: participants,
-            },
-          },
-            create: participants.map((participant) => ({
-              user_id: participant,
-            })),
-          },
+      participants:
+        participants !== undefined
+          ? {
+              deleteMany: {
+                user_id: {
+                  notIn: participants || [],
+                },
+              },
+            }
+          : {},
     },
     select: {
       id: true,
diff --git a/src/app/api/event/validation.ts b/src/app/api/event/validation.ts
index da5912f..b8e176b 100644
--- a/src/app/api/event/validation.ts
+++ b/src/app/api/event/validation.ts
@@ -113,7 +113,6 @@ export const createEventSchema = zod
 // ----------------------------------------
 export const updateEventSchema = zod
   .object({
-    id: eventIdSchema,
     title: eventTitleSchema.optional(),
     description: eventDescriptionSchema.optional(),
     start_time: eventStartTimeSchema.optional(),