Missing cities were breaking the month display, corrected

app/helpers/events_helper.rb

@@ -44,10 +44,9 @@ module EventsHelper
       end: l(event.end_time, format: :at)
   end
 
-  # Select the events to display in a month, sorted
+  # Select the events to display in a month
   def month_events(events, date)
     events.select { |e| (e.start_time.to_date..e.end_time.to_date).cover? date }
-          .sort_by(&:city)
   end
 
   def display_attr(item, label, value = item[label])