Minecon was held in "Las Vegas" last year so americans went there, this year it was in Paris but now i think it should be in Sweden,Germany,England or Swiss this year!
But though there are more Minecraft communities in europe than in US such as the Yogscast in England. Sry but i asume that Minecon isnt gonna be in the US since "Mojang prefeers locations which are safe and with minimum criminal activity and hobo's, insuring the best qualities for the event "