A few months ago a work colleague (actually my direct superior) told me to keep a date free for a party in July when he wanted to entertain some of the people who work for him and their partners. We didn't really want to go as I dont like him and we all at work think he's a prat, but thought it would be politically correct to put in an appearance. He has obviously forgotten that he has invited us (as I learnt through another colleague who was told not to mention the party to me). I now obviously have no reason to go but think I'd get much more mileage out of turning up and embarassing him. What should I do?