BronyCon just announced they will be in the Baltimore Convention Center in the Inner Harbor for 2013, the same place where Otakon (the second largest anime con in the nation) and Baltimore Comic Con (home of the Harvey Kurtzman Awards) are held.
I think Maryland is the perfect place for BronyCon. Did you know Lauren Faust grew up in Southern Maryland. As a MLP fan I always was a little annoyed that I was never able to attend a Brony convention since they are all so far away from Baltimore, ironically I will be leaving Baltimore this spring after graduation. I will still make it a point to finally attend BronyCon. The Inner Harbor is a lovely place for a con, it's right across from Fort McHenry where the Star Spangled Banner was written during the War of 1812.