Help with local creep

hi! I’ve never done this before and I’m not sure exactly what I am looking to do. It is just that I don’t have any other options and I am stuck in a bad situation. to make this short and avoid rambling, my wife hosts a open mic show weekly at this one bar. This creepy musician has been coming lately, and he has made both rude and completely inappropriate sexual comments to my wife and to another woman on staff. He also takes photos with girls. He meets at shows and puts them together in a collage that he prints and hands out to people with his number on it as sort of his sexual hit list, which is what he has called it. I have confronted the guy and tried to get him to leave, but he insists on coming about every other week and the bar owners have been very hesitant to ban him because he is a well-known musician in town and they are afraid of the ramifications. Obviously, the simplest move would be to just stop going to this function every week however it is important for my wife and she meets a lot of other musicians there, but it is not a safe space. What are some ways that I could fuck with and annoy this musician in order to make him want to leave and or expose him as a creep to other people? I should also be clear that I am trying to not embarrass my wife who is already irritated at the whole ordeal.

Edit: two very important details I forgot to mention, he has inappropriately touched my wife. Grabbing her chest through his coat and calling it an accident. He also has her photo on this stupid fucking poster. He hands out to everyone. Also, he is 76 years old. Which should mean he is harmless but to me means I cannot just go beat the guy up as I would do serious damage to him and probably not have many people on my side for that.

Any advice would be appreciated .