get() returned more than one EventParticipant -- it returned 2!

[hancush]

MultipleObjectsReturned: get() returned more than one EventParticipant -- it returned 2!
  File "django/core/handlers/base.py", line 149, in get_response
    response = self.process_exception_by_middleware(e, request)
  File "django/core/handlers/base.py", line 147, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "django/views/decorators/cache.py", line 57, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File "django/views/generic/base.py", line 68, in view
    return self.dispatch(request, *args, **kwargs)
  File "django/views/generic/base.py", line 88, in dispatch
    return handler(request, *args, **kwargs)
  File "django/views/generic/base.py", line 157, in get
    context = self.get_context_data(**kwargs)
  File "councilmatic_core/views.py", line 159, in get_context_data
    context.update(self.extra_context())
  File "lametro/views.py", line 52, in extra_context
    extra['current_meeting'] = self.event_model.current_meeting()
  File "lametro/models.py", line 300, in current_meeting
    return calculate_current_meetings(found_events)
  File "lametro/utils.py", line 77, in calculate_current_meetings
    if legistar_meeting_progress(previous_meeting):
  File "lametro/utils.py", line 109, in legistar_meeting_progress
    organization_name = EventParticipant.objects.get(event_id=event.ocd_id).entity_name.strip()
  File "django/db/models/manager.py", line 122, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "django/db/models/query.py", line 391, in get
    (self.model._meta.object_name, num)

Sentry link: https://sentry.io/datamade/lametro-councilmatic/issues/558790581/

I've just run import_data locally and then queried for event_ids with more than one EventParticipant (select event_id from councilmatic_core_eventparticipant group by event_id having count(*) > 1), but found none. I suspect something was deleted and recreated (hence, import_data on a fresh system would not contain the duplicate). If that is the case, this is related to opencivicdata/pupa#295 err, no, that doesn't make sense.

[hancush]

(In the meantime, I've removed the offending code from the homepage in #304.)

[hancush]

This code path has been removed.