text: from django.db.models import Q
  from django.utils.timezone import now
  from django.views.generic import ListView
  
  from pretix.base.models import Event
  from pretix.presale.views import OrganizerViewMixin
  
  
  class OrganizerIndex(OrganizerViewMixin, ListView):
      model = Event
      context_object_name = 'events'
      template_name = 'pretixpresale/organizers/index.html'
      paginate_by = 30
  
      def get_queryset(self):
          query = Q(is_public=True)
          if "old" in self.request.GET:
              query &= Q(Q(date_from__lte=now()) & Q(date_to__lte=now()))
              order = '-date_from'
          else:
              query &= Q(Q(date_from__gte=now()) | Q(date_to__gte=now()))
              order = 'date_from'
          return Event.objects.filter(
              Q(organizer=self.request.organizer) & query
          ).order_by(order)
  