I think Minecon should be held in Kansas City, Missouri, in the United States. Why? Well, look at the reasons below.
Community: The community here at Kansas City are very nice people. They are always welcoming, and friendly. The local news here are also interesting.
Food: Kansas City is the heart of barbecue. Most famous restaurants sit right here in Kansas City, such as Arthur Bryant's or Gate's BBQ.
Convention Center: There are many places where Minecon should be held, such as the Sprint Center or the Kansas City Convention Center, which is moderately huge.
Hotels: There are enough hotels down in Kansas City (especially on the Plaza) to fit just about everyone who comes. Some of the best hotels sit right on the Plaza.
Airport: The Kansas City International Airport (MCI) is very big, and can fit enough people that are coming. There are also a lot of gift shops and restaurants there, especially local ones, that you can purchase souvenirs from.
Thanks for reading my suggestion, and try to pass it on to the Mojangstas!