what you should have done is this:
lean over and whisper into the guy's ear and tell him "if you ever do that again to any one you wont have to worry about missing the bowl ever again" squeeze hard and then proceed to give him a hard thump in the area, leave. yes your show has been ruined but that happened when he sexually assaulted you.
The women are most likely high so a nice conversation should stop that if you act buddy buddy, and ask them to not touch you because you have boundary issues. if they persist freak out and tell them it reminds you of being assaulted as a child, if they continue after this, high or not, you need to hurt them. This is done best by grabbing the head of the groups hair, and bringing her, by the hair, towards you and down sharply into your knee or the chair. they will then scatter or one of them will move at you, this would take some practice to block normally, however you being smart should cheat try to catch the arm and pull here towards you sharply and with your other hand grab her hair and then quickly let go of her arm move your hand to her neck and drive her down to the ground. Careful how hard you do this you want a concussion not death.
think this is extreme? you told them they reminded you of being molested, lie or not, this makes the super douches and deserving of much more.
Your concert was ruined by this and you let them get away with sexual assault. there was no reason to tolerate it and the went to far, if you did not snap at them or felt vulnerable i would suggest some self defense classes, not theme classes, but real self defense from the basics.