diff --git a/fet2020/posts/models.py b/fet2020/posts/models.py
index 04ec1f19..09138c34 100644
--- a/fet2020/posts/models.py
+++ b/fet2020/posts/models.py
@@ -237,6 +237,8 @@ class FetMeeting(Event):
     def clean(self):
         if self.event_start is None:
             raise ValidationError(_('Das Datum des Events fehlt.'))
+        elif self.event_end < self.event_start:
+            raise ValidationError(_('Das Ende des Events liegt vor dem Beginn.'))
 
         slug = slugify(self.event_start.date()) + "-" + slugify("Fachschaftssitzung")