I remember the first time I went to an anime convention, and was SO EXCITED because they were going to host a DDR tournament!
Then I went into the room where the tournament was supposed to be held and almost died. They were routinely shutting down the room just to try to air it out, and were doing routine announcements of "I do not care if you think you do not smell. Everyone needs to go back to their hotel and shower before coming back. We are serious."
I didn't enter the tournament.