Page not found (404)

Request Method: GET
Request URL: http://172.20.0.4/ru/koncerty/koncert-v-ramkah-kamernogo-festivalya-soyuza-komozitorov-rossii-pyat-vecherov/
Raised by: contents.views.EventDetail

Не найден ни один Концерт, соответствующий запросу

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.