Fix unhappy mypy timezones

This feels like it's not the right way to do it but converting event_tz
to be a pendulum timezone causes other errors. This seems to work so
ship it

apps/schedule/base.py

@@ -650,7 +650,7 @@ def workshop_steward_venue(venue_id: int):
         .filter(
             WorkshopProposal.type.in_(venue.allowed_types),
             WorkshopProposal.is_accepted,
-            WorkshopProposal.scheduled_time > pendulum.now(event_tz),
+            event_tz.localize(WorkshopProposal.scheduled_time) > pendulum.now(event_tz.zone),
             WorkshopProposal.scheduled_duration.isnot(None),
             WorkshopProposal.hide_from_schedule.isnot(True),
             WorkshopProposal.user_scheduled.isnot(True),