Ha ha! I can answer that one, Fortunato: Greg already told me in a PM that the DC museums aren't his thing.

Hey, Greg, what about going out for some contra dancing? Here's a page from the Traditional American Dance and Music Society of Richmond, Virginia. Unfortunately, their schedule of dances doesn't match your schedule, but scroll down the page to "Other Contra Dances in Virginia" and "Other Events", and you'll find links to several organizations that will hold dances while you'll be in the US: http://www.leafpile.com/contra.htm