dnscms: use wagtail pageviewsets everywhere

dnscms/events/wagtail_hooks.py

@@ -1,6 +1,6 @@
 from wagtail import hooks
 
-from .admin import event_page_listing_viewset
+from .admin import event_sidebar_viewset, event_explorer_viewset
 from .views import event_organizer_chooser_viewset
 
 
@@ -10,5 +10,10 @@ def register_viewset():
 
 
 @hooks.register("register_admin_viewset")
-def register_event_page_listing_viewset():
-    return event_page_listing_viewset
+def register_event_sidebar_viewset():
+    return event_sidebar_viewset
+
+
+@hooks.register("register_admin_viewset")
+def register_event_explorer_viewset():
+    return event_explorer_viewset