You realize the clan scene is dead, right?
April 2008. French clan scene seemed fully dead. wwF organise TFT tournament (French Tremulous Tournament).
12 registered clans
about 70 registered players
2 new clans created for the tournament (One of them still alive)
38 matchs played
All french clans up and aware for 2 months.
Well, it maybe not a so bad idea to organise a new tournament

A problem with internationalisation is where ? US (and 150-200 ping for european), Europe ? (and 150-200 ping for US) (and I don't talk about other countries with tremulous community ...)
Maybe we could ask to amanieu to host the tournament ? so everyone will have 400 ping

And please, let me give you an advice : match should be planed by organizers, not by players. That's why Gamefest failed, and why TFT successed.