I will be in Washington DC from approximately 5:30pm on Friday, May 23rd to 11:30am on Sunday, May 25. Mostly I'll be at the May version of this, the OLPC meetup at Gallaudet - gotta un-rustify my ASL as much as possible. (Fact that occasionally surprises people: I had a sign-language interpreter through most of my childhood.)
If you're in the area, I would love to meet up, hang out, and hack with people. Ping me.
[Edit: Yep, that's Sunday, May 25, not June... thanks to Sa'am for pointing out that I'm spending 3 days, not 1 month, in DC.]