I need suggestions and ideas

I have an idea for a tournament or a playoff on either Gears of War 2 or Left4Dead. I just don't know how to make it. In Gears it could be a traditional death match or one of the other game modes online and in left4dead it could be a time trial or something of that sort....or maybe other games could be added too.... Do you guys have any idea what would be the best way, which idea would interest you or make you join??

I meant something that resembles a "deathmatch"...like guardian...just as submission would be like a traditional "capture the flag"

which would also be cool for a competition...

Halo

I guess Halo should be better...maybe by teams? or Alone....Well, Im opened for suggestions..I forgot to mention, theres going to be a small price at the end...small but a price none the less..and also we will keep the stats at the end...

It should be fun, friendly tournament with a small price, stats and everything...doesn't get better than that...you can join my page clicking my sig so you can give more suggestions and get notified when the event starts.