Ibn Majah

1؎ : Most scholars hold the view that attending an invitation (da‘wat) where there are acts contrary to the Shari‘ah—such as music and dancing, immodesty, lack of proper covering (pardah), consumption of alcohol, or use of other intoxicating substances—is not obligatory. If, upon arriving, one witnesses such things, one should return and not partake of the food. If the attendee is a religious scholar (‘alim) or leader (peshwa) and is unable to remove these wrongs, then he should also leave, because remaining there constitutes disrespect and dishonor to the religion, and it will embolden others to commit sins. This applies when one was unaware of these matters before attending the invitation. However, if it is known beforehand that there will be something contrary to the Shari‘ah at the gathering, then accepting the invitation is not obligatory upon him.