Hmm, I'm from the DC area, but I don't personally know of any startups that are highering at the moment.

There was a group of HN readers that meet a couple of times, but I don't know what's happend to that.

You can find some tech events: http://www.dctechevents.com/ and I'm sure that there is more.

There is a lot of opportuity, given the recent and predicted growth in government, but not all of it is being tapped; at least not in an organized way.