These are the rules I had for my event:
Crews Ruleset
-Every player must write their character down on a sheet of paper prior to the battle.
-The first stage is Smashville
-Smashville, Battlefield, and Yoshi's Island (Brawl) are on Random
-Final Destination, Lylat Cruise, Pokemon Stadium, Castle Siege, Halberd, Delfino Plaza, and Frigate Orpheon are legal, though not on random
-When a battle ends, the player who won keeps all of the stocks they have remaining. The losing team sends in their next player. This player may either choose a random stage, or to pick a stage from any legal selection. If the player coming in picks a stage, the player staying in from the winning team may pick any character. If random is chosen as the stage, they must stay their character. The player coming in must go the character they wrote on the paper in the beginning, however if their opponent opted to change character, they may pick a different character.
-Every game will have a 10 minute timer. If time runs out, and a player is above in stock, that player will stay and continue with the amount of stocks equal to how many more they have than their opponent. For instance, if time runs out and Player A has 3 stocks and Player B has 2 stocks - Player A will move onto the next game with 1 stock. Both teams will lose 2 stocks from their total because of this. If the two players are tied in stocks, whoever has less percent will move on with one stock remaining.