^^
ASAP; you may want to put up a multiple choice poll, including [2.0] and PMC entrants, then you'll have an organized list. Actually I would announce the starting date, and give a week for all the entrants to be informed and time to reply with confirmations. Also I would make the deadline a week after that. Then each round after should have shorter deadlines.
I think the qualifying rounds should be theme-less.
Also are the brackets going to be head to head, each bracket with a theme? Or just a round by round poll, eliminating the lowest votes? Also the polls rules should be discussed beforehand, on how they will work, will they be single or multi choice polls?
Just so there is no confusion later.