UPD: more cool participant admin stuff.

dav_registration/models.py

@@ -9,10 +9,10 @@ from django.utils import timezone
 from django.utils.encoding import python_2_unicode_compatible
 from django.utils.translation import ugettext_lazy as _
 
+from dav_base.validators import DAVNumberValidator
 from dav_events.models.event import Event
 
 from . import signals
-from .validators import DAVNumberValidator
 
 logger = logging.getLogger(__name__)