If you happen to be located in the Midwest and want to get together with fellow collectors to buy, sell, trade, and discuss ponies you're in luck! The Cincy MLP Collectors are holding the 3rd annual Cincinnati Pony Meet on Saturday August 1st. Details can be found on their official message board or you can follow the updates on this MLPArena thread.
I know several of the girls who are planning the event and they are really great! At the moment I'm tentatively planning on attending and will be bringing book copies to sign and sell for anyone who might be interested.