diff --git a/src/api/events.py b/src/api/events.py
index fac955d..9115c79 100644
--- a/src/api/events.py
+++ b/src/api/events.py
@@ -50,12 +50,16 @@ class _BaseEventData(BaseModel):
 class EventData(_BaseEventData):
     """Data about an event sent to the user."""
 
+    id: PydanticObjectId
     owner_user_id: PydanticObjectId
     attendee_ids: list[PydanticObjectId]
     created_at: datetime
 
     @classmethod
     def from_event(cls, event: Event) -> "EventData":
+        if event.id is None:
+            raise MissingIdError(event)
+
         if isinstance(event.user, Link):
             raise UnfetchedLinkError(event.user)
 
@@ -63,6 +67,7 @@ class EventData(_BaseEventData):
             raise MissingIdError(event.user)
 
         return cls(
+            id=event.id,
             owner_user_id=event.user.id,
             title=event.title,
             description=event.description,