Great idea. However, instead of calling it "FlyerTalk under 30 get together" why not just make it a "FlyerTalk get together" with a special emphasis on young travelers? I've met many people on this board who could probably add much to such an event (and happen to be above 30).
How about opening up the event to anyone under 30, someone who has been under 30 years of age at some point in the past, or someone who is under 30 years in spirit?