Have all your guests brings their id to share and share alike about whatever is going on. Fair is fair and square is square and nary a one will be exlucided.
Food drink and much JOCULARITY as well as taking a moment to thank the gut/arse guy for making it all happen again.
Gonna invite gut/arse guy to your party? Why not? What could it hurt? Take pictures and cheer him on and ask him to speak. He will love you bigly longly. Everyone says so.