No offence but it seems like you just stole this idea from Nanner in the Event system thread.

I really like the idea,but I have to disagree with Goat a little bit. I don't see the problem in throwing an idea out and not having the details all worked out. Sometimes its best to leave it open to suggestion and getting more ideas and putting them together to make a workable system.

As far as selecting a field or "teams" for this kind of tournament I'm sure somebody can come up with a formula to get a set number of teams. Maybe the average amount of tower hours for guild in a 3-4 month period.