I think KW's idea is great!
But honestly, why go thru it. It has caused you enough angst as it is. Why give them the power over you to even show up, waste an evening. It is not like they want to ask you if someone stumbled you and you need help returning. You know that all it will do is rial you up and cause you to get frustrated. I would ignore it and go about your life. They have already made up their minds. You are no going to change their minds and they are not going to change yours. Pearls before swine, pearls before swine, people. They are idiots, do you really want to spend an hour out of your day with idiots. If so, they have fun. But again, I like KW's idea better. Now that would be a head game to play on them.