old_contents: from functools import wraps
  
  from django.http import HttpResponseNotFound
  from django.shortcuts import redirect
  
  from core.utils import get_event_page
  
  
  def organiser_only(function):
      """
      Decorator for views that checks that the user is logged in and that
      they are a team member for a particular page. Returns 404 otherwise.
      """
  
      @wraps(function)
      def decorator(request, *args, **kwargs):
          if not kwargs.get('city'):
              raise ValueError(
                  '"City" slug must be present to user this decorator.')
  
          if not request.user.is_authenticated():
              return redirect('core:event', kwargs.get('city'))
  
          city = kwargs.get('city')
          page = get_event_page(city, request.user.is_authenticated(), False)
          if page and (request.user in page.event.team.all() or request.user.is_superuser):
              return function(request, *args, **kwargs)
          return HttpResponseNotFound()
      return decorator
  
new_contents: from functools import wraps
  
  from django.http import HttpResponseNotFound
  from django.shortcuts import redirect
  
  from core.utils import get_event_page
  
  
  def organiser_only(function):
      """
      Decorator for views that checks that the user is logged in and that
      they are a team member for a particular page. Returns 404 otherwise.
      """
  
      @wraps(function)
      def decorator(request, *args, **kwargs):
          city = kwargs.get('city')
  
          if not city:
              raise ValueError(
                  '"City" slug must be present to user this decorator.')
  
          if not request.user.is_authenticated():
              return redirect('core:event', city)
  
          page = get_event_page(city, request.user.is_authenticated(), False)
          if page and (request.user in page.event.team.all() or request.user.is_superuser):
              return function(request, *args, **kwargs)
          return HttpResponseNotFound()
      return decorator
  
subject: Define 'city' at top decorator