my guess is the corcoran would do a 25. they also probably have the best food. i would call, and offer to prepay.

http://www.toddgraysmuse.com/contact.html

Private Events

Katie Musser
Phone: 703-408-2120
[email protected]

they have rooms all over the place, so they should be able to serve agroup of 25. i have been to a number of corcoran events that use the cafe for food service.