The way it works is you try to keep your own fires burning while putting the flames of your opponents out. I've seen numerous mini raids on major cities and massive skirmishes near the small-town fires. Like many players, I've got to give props to Blizzard for adding this mechanic to the festival. The buffs are pretty awesome too.
I've enjoyed this celebration more than any WoW holiday in the past. Have you been joining in the desecrating fun?
Remember to check out the "It Came From the Blog" event this Sunday, June 29 at 7Pm Eastern.