I live in DC proper, not far from the metro (green/yellow line) and I will most likely have space for one person to sleep on my futon during WIS2. I have a studio apartment, but it’s fairly big as far as those things go, so it wouldn’t be a problem to share for the weekend.
I know it’s a bit early, but shoot me a message if you’re interested and we can talk more.
Also, the futon is probably more comfortable for one person (it’s full size), but it can fit two or someone can sleep on the floor.
Unfortunately, my place is too small to accommodate more than one or two people!