I believe Korea had one recently. At least I think it was a battle tournament, it ended with some kind of weird siege event after the group pvp.
Edit: After checking their official site, it seems like it was another event on their "game show", rather than a battle tournament. We so need a show like that though, I hope our GM's and/or QA aren't camera shy. :D
it would be quite nice but then without a pre determined list of
allowed classes so we will be able to see real pvp/seige groups of
different servers in action against eachother ^^