diff --git a/fet2020/posts/models.py b/fet2020/posts/models.py
index 40e4a8e6..f73a1c19 100644
--- a/fet2020/posts/models.py
+++ b/fet2020/posts/models.py
@@ -319,6 +319,7 @@ class Event(Post):
         super().save(*args, **kwargs)
 
     def clean(self):
+        super().clean()
         if not self.event_start:
             raise ValidationError(_("Das Datum des Events fehlt."))
 
@@ -374,6 +375,7 @@ class FetMeeting(Event):
         return slug
 
     def clean(self):
+        super().clean()
         if not self.slug:
             self.slug = self.__get_slug()