UPD: dav_events: renamed utils method to roles.

dav_events/models/event.py

@@ -16,10 +16,10 @@ from django.utils.encoding import python_2_unicode_compatible
 from django.utils.translation import get_language, ugettext_lazy as _
 from django_countries.fields import CountryField
 
+from . import get_ghost_user
 from .. import choices
 from .. import config
 from .. import signals
-from ..utils import get_ghost_user
 from ..workflow import DefaultWorkflow