I'm quite sure that this has been discussed in smaller, private chats. (I have been in one myself.)
I do like the idea, but as Raw mentioned, people are from different states and even from different parts of the world.
It'd be quite difficult to bring such a community together. It'd be a lot of people missing out on it.
I, myself, live in Europe - Sweden - and I believe it'd be nearly impossible for me to get to America for such a thing.
(I'd guess it'd be held in America as most members are from there, or close by.)
If such thing was to happen, I'm guessing there'd be one held in the U.S and one in the EU,
a shame in my opinion as some people have their 'best friends' and such in a different part of the world.