Page not found (404)

Request Method: GET
Request URL: https://mice.optimahotels.com.ua/uk/confservice/%D0%9F%D0%BE%D0%BB%D1%8F%D0%BD%D0%B0/

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.