Ok, enough talk, more action.
All you folks who live in, or within striking distance of, the DC area and are interested in hanging out: let's do this thing.
I've created a doodle poll to get an idea of which dates might work: http://doodle.com/yhnsnnbzy2sbm4f3
Don't worry about exact times, the "10 AM" is just a proxy for "morning" and the "2 PM" just means "afternoon."
Location-wise, my suggestion is the National Building Museum since it's probably more or less equally (in)convenient for people coming in from different areas; it's metro-accessible and I've found parking to usually be not-that-hard on the weekends; it has a lobby that alone is enough to entertain my toddler, plus an awesome kids' playroom.
Who is in?!?