What is the ruling on mixed wedding halls in villages where there is adherence [to religious principles], unlike cities?

The questioner did not specify the nature of these halls or what takes place within them. However, the ruling on impermissible mixing is explained in Fatwa: 123254. If the mixing in these halls occurs in a manner not permissible by Islamic law, then gathering in them is forbidden, even if it is considered less sinful than others due to fewer transgressions. It is obligatory to strive to find permissible alternatives free from transgressions for holding weddings and similar events in accordance with Sharia.