Cleanups and bugfixes for (#2 and #8)

modules/utils/__init__.py

@@ -3,6 +3,9 @@ from .autocomplete_utils import (
     autocomplete_event_stages,
     autocomplete_languages,
     autocomplete_timezones,
+    autocomplete_user_available_events,
+    autocomplete_user_registered_events,
 )
 from .cache_utils import restore_from_cache
+from .event_utils import validate_event_validity
 from .logging_utils import get_logger, get_logging_config