Magic Forums

Can someone recommend an effective spell to stop someone from going to a public event (concert, show, party etc.) ?
My friend's ex turned violent and has been stalking her and also harassing us, her friends since they broke up. He is paranoid and convinced that she cheated on him with someone she's just friends with. We've seen him physically attack her and violently push her to the ground before and he has threatened to beat them both up. He has done things that are much worse. He is a crazy stalker, every weekend he tries to find out where she will be by trying to manipulate mutual friends. He goes to every place in town looking for her, I have witnessed it myself on several occasions, he walks into the place with friends, does the whole tour or even several rounds looking for her and then leaves. He even stares at us angrily. Other people have seen him do the same thing and everyone is scared when they even go out to dinner with her because he's a fighter and clearly suffering from a psychosis.
There will be a happening in a couple of weeks time and yes it may be cancelled due to the situation in the world still but it is important for all of us to make sure that he will not come and ruin it for everyone, again. It is a public concert and he knows she'll definitely be there. The situation has been causing conflict and friends have started to avoid her because of how this is affecting all of us. It is just not fair to have our experience ruined by this angry paranoid guy but literally nothing anyone can do as he isn't breaking any rules.
Can anyone recommend a fast working spell that would stop him from coming to this event? And hopefully also future ones ... Thanks!