Page not found (404)

Request Method: GET
Request URL: https://alcalaesmusica.org/events/1209/concierto-intimissimi-hostel-complutum/
Raised by: bands.views.event.event_detail

No Event matches the given query.

You're seeing this error because you have DEBUG = True in your Django settings file. Change that to False, and Django will display a standard 404 page.