Eh, I think it would be good to be in Las Vegas. It's a very big city, and it's in the US, with the bonus of it not being too cold for some of the more squeamish Minecrafter's out there. Either Vegas, or Seattle.
I would love it if it was somewhere near Olympia WA since that's where I live(make it Seattle or something). I don't have any chances to attend minecon as a High School student, but maybe, if it was pretty close to me, I could finally attend Minecon for the first time in my life. Preferably in September or October as I will be busy in all of August and the first part of September,