diff --git a/gestion/migrations/0003_events.py b/gestion/migrations/0003_events.py
index 13d37097..40faca91 100644
--- a/gestion/migrations/0003_events.py
+++ b/gestion/migrations/0003_events.py
@@ -22,12 +22,12 @@ def import_events(apps, schema_editor):
     # in this table for each value of the old `location` field.
     OldEvent, NewEvent = models[0]
     Location = apps.get_model("gestion", "Location")
-    locations = []
+    locations = set()  # A set to prevent duplicate entries
     events = []
     for event in OldEvent.objects.values():
-        locations.append(Location(name=event["location"]))
+        locations.add(event["location"])
         events.append(event)
-    Location.objects.bulk_create(locations)
+    Location.objects.bulk_create([Location(name=name) for name in locations])
     map_loc = {
         loc.name: loc
         for loc in Location.objects.all()