Your ex has no bearing on your life. He is of no importance. Some woman at the bar means even less. Not sure why these unimportant people effect you so badly. Let it go. Your fiancées brother is of course important but his issues with your fiancée have nothing to do with you and it could be all resolved at a later time. Tell your fiancée to postpone all this until later on.

No i don’t believe weddings are supposed to stir drama.

Focus on the positives. No fighting, crying or drama. These are exciting happy times! Did you pack your pretty outfits and your dress? How about swim suit? I imagine water is going to be great! It sounds so exciting! Do you need a chaperone lol lol?