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Same idea as rampage (could even be an option for rampage, really) - but allows people to join any time during the duration of the event, instead of locking the door when the game starts.
I think a 30-60 minute Brawl would be awesome, where people could just jump in, join the brawl, fight a bit, leave if they want, maybe come back, etc - and other people could join any time they like, such as if they were disconnected, wanted to go buy something really quick, or logged in right after it started.
I would personally use this on a daily basis, and would prefer it over rampages for anything other than single-elimination combat "tournament" events, which is what Rampage is designed to be. The big thing is just that I hate that people can't join arena games while they're in progress.