Port to new django version - not yet fully working

- location field makes problems

eventplanner/serializers.py

@@ -1,14 +1,12 @@
 from rest_framework import serializers
-from models         import EventParticipation
-
-
+from .models import EventParticipation, Event
 
 
 class ParticipationSerializer(serializers.ModelSerializer):
-    event  = serializers.PrimaryKeyRelatedField( many=False, read_only = False )
-    user   = serializers.Field( source='get_username' )
-    status = serializers.CharField( source='status', required=False )
-    
+    event = serializers.PrimaryKeyRelatedField(many=False, read_only=False, queryset=Event.objects.all())
+    user = serializers.Field(source='get_username')
+    status = serializers.CharField(source='status', required=False)
+
     def get_identity(self, data):
         """  This hook is required for bulk update.  """
         try:
@@ -19,6 +17,3 @@ class ParticipationSerializer(serializers.ModelSerializer):
     class Meta:
         model = EventParticipation
         fields = ('event', 'user', 'status', 'comment')
-
-
-