You won't organize everything good until you're gonna make dates for EVERY GAME by yourself, dear organizer (whoever you are). Believe me because I've got some kind of an experience. Those "OK GUYS NOW TALK WITH EACHOTHER WHEN YOU WANNA PLAY" never works, NEVER ! Maybe for 10 - 20 % of tourney games, then it becomes dead. You really NEED to make all dates for everyone and always remind them about it via Skype or something ..
Good luck ;P