Hi, you try to talk to him -and he goes out of the room. Perhaps you could persevere-so that he is forced to discuss it. He needs to know, that like it or not, this is a massive deal for you. He has piled on the stress by organising this. It may be his way of trying to cheer you up but I suspect it’s more a way of trying to cheer himself up-by pretending that the situation you are in, just isn’t there. It’s fairly immature ...and why on earth has he involved people that you can’t stand? Does he know you don’t like them? If this event feels way too much for you at the moment, it would be reasonable for you to say that you just can’t go. But if there’s part of you that would like to try to enjoy it, explain that to him.....get him on your side....it doesn’t feel like he’s there at the moment, Good luck.