If I am going to a concert with my wife, can I sit together with her in family seating, or do we have to sit in the men and women sections separate?
Men and women are not supposed to be sitting together at any function. Sources: מפורש לגבי שמחת בית השואבה - סוכה נא, ב. וגם לגבי לוי׳ - סנהדרין כ,…