I feel like I'm the only person that doesn't want minecon in the state their live in... I want it in Idaho...
Georgia is host to one of the largest Sci-Fi/Fantasy cons every year. Dragon*Con. Maybe for a Gaming convention as big as Minecon why not do Boston, or maybe Virginia even Pennsylvania.
I'd say the UK but just a bunch of 7 year olds play minecraft around here but it'll be nice to get them out of the way