Page not found (404)

Request Method: GET
Request URL: https://nisarga.center/event/2019_04_27-28_MK_Krasnodar/form/
Raised by: events.views.ParticipantFormView

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.