improve event organizer selection, show on web

dnscms/events/wagtail_hooks.py

@@ -0,0 +1,8 @@
+from wagtail import hooks
+
+from .views import event_organizer_chooser_viewset
+
+
+@hooks.register("register_admin_viewset")
+def register_viewset():
+    return event_organizer_chooser_viewset