We're all over NoVa, DC, and MD. For how long are you visiting? I think the next thing on the schedule is in DC on 8 Jan (Sunday).
A bit up in the air, a short visit but at least through Monday evening. At some point will be heading down the way to Baltimore and then south.
Thought I'd check if anyone was nearby and free the next few days, know it's short notice.
Email the group. We were headed into DC on short notice two years ago, someone said they'd organize something at their house, sent a message to the group, and like 20-30 people showed up, it was great, met a few forum people (LongWayToGo, aetherie, etc.), had a lot of fun. They had had just had a meetup the week before, so a lot of people didn't come (I guess they have a few hundred people in that group), and there was almost no overlap between the two meetups--it worked well as a time for people who had been unable to make the one the week before to come chill.
See if someone's willing to host something, or at least suggest a place (you suggest a time). I bet you can get something put together on a day or two's notice and get as many people (a dozen plus) as most areas would get with a months' notice.