Cam - I won't be playing in this tournament if I'm coordinating it, so it doesn't matter to me. I don't mind playing against Urien, he just really aggrivates me. IMO it doesn't come down to the better player winning against him, it comes down to the better guesser.
galfordo - When you get an invite, a little circle will pop up next to the avatar by your life bar. If you ever see one of those, press start and go to friends list and it'll tell you who's sending an invite and for what game. I would mute the music, but then I wouldn't hear the music that plays when somebody joins my game, so I'd end up sitting there reading or whatever while somebody sits and waits for me to start the game.