If there is a competition, this is probably how it will work:
The guy organizing this thing sorts the contestants into pairs (or sometimes groups of three). Each pair gets a trick or a feature, for example "900", "rodeo" or "down-flat-down rail". Then the competitors in that group record the best 900, rodeo or down-flat-down hit they can. You can single, double, triple, switch it or whatever, as long as the rotation matches the one given to you. If you are given a feature you may hit it however you like.
The contestants record their tricks and post them in their thread (each match up usually gets their own thread, check this forum for older competition match ups and you should get the idea...). The other cult members then vote for their favorite trick in each match up by commenting the submitter's name in the match-up thread. The contestants in each match up who receives the most votes moves on to the next round. As the competition progresses the tricks and features get more and more advanced; in the last comp I think the finalists were allowed to post any single run they thought would impress the viewers most. I guess the Admin of this comp will decide which map to use.
Repeat until only the winner remains.
Note: The contestants are given deadlines; you are usually given 48 hours to post your trick. After that 24-48 hours is normally reserved for voting. Failure to submit a video results in disqualification.