Should a committed friend who has recently grown a beard and is going to hold a "Jahili" wedding ceremony in a wedding hall, and who was unable to cancel it, be advised to shave his light beard to avoid giving a bad impression of the beard, or should he keep it?

It is obligatory to advise the friend whose wedding will be held, that he should strive to prevent reprehensible acts. If they insist on committing them, then it is not permissible for him or his wife to attend, because the lowest degree of enjoining good and forbidding evil is to abandon the place where the reprehensible act is occurring. It is not permissible to advise him to shave his beard to avoid the place of reprehensible acts.