Every campaign has an end.

Drop ahoy, because it's more trouble than it's worth. This means dropping
visits, campaigns, targets.

Campaigns are better run to analytics, such as:
* https://matomo.org/docs/tracking-campaigns/
* https://matomo.org/docs/tracking-goals-web-analytics/
* https://support.google.com/analytics/answer/1012040?hl=en

app/controllers/admin/events_controller.rb

@@ -92,7 +92,6 @@ module Admin
       @event.submitter = current_user
 
       if @event.save
-        ahoy.track 'Event submission', title: 'New submission'
         redirect_to admin_conference_program_events_path(@conference.short_title), notice: 'Event was successfully submitted.'
       else
         flash.now[:error] = "Could not submit proposal: #{@event.errors.full_messages.join(', ')}"