I completely agree with coolswing. Community tourneys should be fun, challenging and exciting.
As a big fan of European football alowe me to suggest a two formats of tournament, both based on multyplayer mode:
1 Regular league system with 4 groups, each with 4 players (football teams). All teams in the group will play each with others. They will report a results and according to them will be create a group standings. Results will be only W, L or tie, no mater of they individual scores in the game. For each W - 3 points, for tie - 1 point and for L - 0 point. The first ones (or the first and the second) in each group will go in semi finals (or 1/4 finals) and so on... In this stage of tourney can be played by the mode best of 3 games (Example A vs B, score 2:1, by the games 34:35, 39:37, 35:37; or score 2,5:0,5 by the games 36:36, 34:36, 35:36). If there will be a ties in all 3 sets, than will be play sudden death in one hole. In this case the both players will have to report a result only of the play in one (or 2, or 3...) hole, couse this game will not be obligatory to get finish.
2 Cup system like the old UEFA cup. There will be a 8 match plays. Also can be use a mode by best of 3 games. The winners will go in 1/4 finals and the losers can play for standings from 9th to 16th place in the tournament. Also the winners in 1/4 will go in semis and losers can play for 5th to 8th place.
It can be given a certain decent period of time to the players to make a contact and find a time schedule to meet up for a game.
These are only suggestions, nothing new, (coolswing also mentioned such a formats) I just wanted, to made them a little bit closer to football nature.