Last weekend I attended Brony Con in Maryland. I'm not a big My Little Pony fan, but I love a good convention. There was a nice vendor room, lots of panels, and tons of cosplayers. I was most impressed with the wide age range of MLP fans. I've also never seen a fan base that was more proud of their Fandom. People were decked out head to to in My Little Pony gear.
You can check out a short video from Brony Con here.