diff --git a/fet2020/posts/models.py b/fet2020/posts/models.py
index b9e4945d..de55356e 100644
--- a/fet2020/posts/models.py
+++ b/fet2020/posts/models.py
@@ -252,6 +252,12 @@ class Post(models.Model):
     def url(self):
         return reverse("posts.show", kwargs={"id": self.slug})
 
+    def clean(self):
+        if self.event_end and self.event_end < self.event_start:
+            raise ValidationError(_("Das Ende des Events liegt vor dem Beginn."))
+        if self.event_start and self.post_type not in ['E','F']:
+            raise ValidationError("Für diesen Post Typ ist kein Event Start zulässig")
+        super().clean()
     def save(self, *args, **kwargs):
         # save the post with some defaults
         if not self.public_date:
@@ -300,12 +306,14 @@ class Event(Post):
 
         verbose_name = "Event"
         verbose_name_plural = "Events"
-
+    def __init__(self,*args,**kwargs):
+        super().__init__(*args,**kwargs)
+        self.post_type='E'
     def clean(self):
         if not self.event_start:
             raise ValidationError(_("Das Datum des Events fehlt."))
-        if self.event_end and self.event_end < self.event_start:
-            raise ValidationError(_("Das Ende des Events liegt vor dem Beginn."))
+
+
         super().clean()
     def save(self, *args, **kwargs):
         if not self.post_type:
@@ -324,7 +332,9 @@ class FetMeeting(Event):
 
         verbose_name = "Fet Sitzung"
         verbose_name_plural = "Fet Sitzungen"
-
+    def __init__(self,*args,**kwargs):
+        super().__init__(*args,**kwargs)
+        self.post_type='F'
     def __get_slug(self):
         slug = slugify(self.event_start.date()) + "-" + slugify("Fachschaftssitzung")