diff --git a/calendar_backend/routes/event/event.py b/calendar_backend/routes/event/event.py
index c33d0ed2..a8dba341 100644
--- a/calendar_backend/routes/event/event.py
+++ b/calendar_backend/routes/event/event.py
@@ -108,18 +108,35 @@ async def create_events(
     result = []
     for event in events:
         event_dict = event.model_dump()
-        rooms = [Room.get(room_id, session=db.session) for room_id in event_dict.pop("room_id", [])]
-        lecturers = [Lecturer.get(lecturer_id, session=db.session) for lecturer_id in event_dict.pop("lecturer_id", [])]
-        groups = [Group.get(group_id, session=db.session) for group_id in event_dict.pop("group_id", [])]
-        result.append(
-            Event.create(
-                **event_dict,
-                room=rooms,
-                lecturer=lecturers,
-                group=groups,
-                session=db.session,
-            )
+        existing_events_query = (
+            Event.get_all(session=db.session)
+            .filter(Event.name == event_dict.get("name"))
+            .filter(Event.start_ts == event_dict.get("start_ts"))
+            .filter(Event.end_ts == event_dict.get("end_ts"))
         )
+        is_unique = True
+        for existing_event in existing_events_query.all():
+            if (
+                {column.id for column in existing_event.group} == set(event_dict["group_id"])
+                and {column.id for column in existing_event.room} == set(event_dict["room_id"])
+                and {column.id for column in existing_event.lecturer} == set(event_dict["lecturer_id"])
+            ):
+                is_unique = False
+        if is_unique:
+            rooms = [Room.get(room_id, session=db.session) for room_id in event_dict.pop("room_id", [])]
+            lecturers = [
+                Lecturer.get(lecturer_id, session=db.session) for lecturer_id in event_dict.pop("lecturer_id", [])
+            ]
+            groups = [Group.get(group_id, session=db.session) for group_id in event_dict.pop("group_id", [])]
+            result.append(
+                Event.create(
+                    **event_dict,
+                    room=rooms,
+                    lecturer=lecturers,
+                    group=groups,
+                    session=db.session,
+                )
+            )
     db.session.commit()
     adapter = TypeAdapter(list[EventGet])
     return adapter.validate_python(result)
diff --git a/tests/event/event.py b/tests/event/event.py
index a048c649..60e98343 100644
--- a/tests/event/event.py
+++ b/tests/event/event.py
@@ -98,6 +98,52 @@ def test_create_many(client_auth: TestClient, dbsession: Session, room_factory,
     assert [row.id for row in response_model.group] == request_obj[1]["group_id"]
 
 
+def test_create_many_clones(client_auth: TestClient, dbsession: Session, room_factory, group_factory, lecturer_factory):
+    time_stamp = datetime.datetime.now()
+    name1 = f"name1_{time_stamp}"
+    room_path1 = room_factory(client_auth)
+    group_path1 = group_factory(client_auth)
+    lecturer_path1 = lecturer_factory(client_auth)
+    name2 = f"name2_{time_stamp}"
+    room_path2 = room_factory(client_auth)
+    group_path2 = group_factory(client_auth)
+    lecturer_path2 = lecturer_factory(client_auth)
+    room_id1 = int(room_path1.split("/")[-1])
+    group_id1 = int(group_path1.split("/")[-1])
+    lecturer_id1 = int(lecturer_path1.split("/")[-1])
+    room_id2 = int(room_path2.split("/")[-1])
+    group_id2 = int(group_path2.split("/")[-1])
+    lecturer_id2 = int(lecturer_path2.split("/")[-1])
+    request_obj = [
+        {
+            "name": name1,
+            "room_id": [room_id1],
+            "group_id": [group_id1],
+            "lecturer_id": [lecturer_id1],
+            "start_ts": "2022-08-26T22:32:38.575Z",
+            "end_ts": "2022-08-26T22:32:38.575Z",
+        },
+        {
+            "name": name2,
+            "room_id": [room_id2],
+            "group_id": [group_id2],
+            "lecturer_id": [lecturer_id2],
+            "start_ts": "2022-08-26T22:32:38.575Z",
+            "end_ts": "2022-08-26T22:32:38.575Z",
+        },
+    ]
+    response = client_auth.post(f"{RESOURCE}bulk", json=request_obj)
+    assert response.status_code == status.HTTP_200_OK, response.json()
+    assert response.json()[0]["name"] == request_obj[0]["name"]
+    response = client_auth.post(f"{RESOURCE}bulk", json=request_obj)
+    assert response.status_code == status.HTTP_200_OK
+    assert len(response.json()) == 0
+    events = dbsession.query(Event).filter(Event.name == name1).all()
+    assert len(events) == 1
+    events = dbsession.query(Event).filter(Event.name == name2).all()
+    assert len(events) == 1
+
+
 def test_delete(client_auth: TestClient, dbsession: Session, room_path, lecturer_path, group_path):
     room_id = int(room_path.split("/")[-1])
     group_id = int(group_path.split("/")[-1])