I won't post this to the forums, because that makes sense and I don't know what to put in here for now, except hey if people want to go with this guy's (@ninja)  meeetup plan, I will halp organize.  Anyways, post here if this is your area or whatever.\
 
My suggested areas:
Baltimore/Columbia MD
Northern VA (reston/dulles area) 
Montgomery County/Frederick County MD (Frederick County is least likely, though that's where I live)
Wash DC (Not as likely because suburbia is far friendlier for people to get places to (esp in cars)
 
Edit 1: if you feel you live in the Was DC metro region of the US and want to come but hate the locales I've listed, this is just my suggestion list.  upon re-reading I realize there's alot of areas we could do and alot of was people like myself could be flexible if needed.  Anyways- just don't turn away because you don't like what I listed as suggestions.