I don't play tournaments, but had an idea for a different type of one.
Participants would sign up to play ALL CC maps against Whambot 1v1 with normal settings (automatic, sequential, escalating, chained; no fog, no trench). they would have to play all games within a month vs Whambot, without playing the same game twice. At the end of their games, they would list their record, and their shortest round game as tie-breaker 1, and longest rounds in a loss as tie breaker 2.
Participants would list their records, I would check the top few to make sure they were accurate.
It would either end there, or the top 2-4 could play Classic same settings in a single elimination mini tournament of champions. I know it's not your normal tournament, but it would be different, interesting, not lock up slots (fast games vs Robot), and not require much admin.