Is it obligatory to prevent one's wife from attending a wedding that contains transgressions (munkarat)? Does the husband sin if he permits her to attend? What is the correct course of action with a wife who insists on attending? What are the Shar'i (Islamic legal) guidelines for attending such occasions?

It is not permissible to attend a place where evil is committed unless there is a necessity, or if the intention is to denounce the evil. A husband must prevent his wife from attending weddings where there is evil, and he is sinful if he does not. If the wife insists on attending and going out without his permission, she is disobedient (nashiz).

The regulations for enjoining good and forbidding evil are many, and they relate to the one performing the duty, the etiquette of performing it, and the matter intended to be denounced.

Ibn Hajar al-Haytami mentioned that it is not permissible to attend a wedding feast if there is evil therein, due to the bad presumption it entails for the invitee. However, if his presence leads to the removal of the evil, then he must attend to fulfill the obligation of accepting the invitation and removing the evil. If he becomes aware of the evil after attending, he must forbid it. If he is unable, he should leave. If he is unable due to circumstances, he should sit, disapprovingly, but should not sit with them if possible.