Shoreleave is a Fan Run Convention that is far superior to any of the Corporate Cons, in my humble opinion. It is not a gaming convention, but there IS a gaming room, and gaming. It is a media convention, with many guest star actors from the Science Fiction & Fantasy genre. I have personally been attending this convention since the early 1990s.
If you are interested in attending, check out their website (do a search for: Shoreleave Convention and Maryland ). I believe this year is its 34th year.