Break out your dandy finery or dress like Victorian lady on an "urban fox hunt" for the third annual ridiculous/fabulous D.C. Tweed Ride, wherein fine-clothed cyclists take to the streets of Washington to recall a more refined time. To learn the start location, free registration is required. (The ride begins at noon.)
Once you've cycled hither and yon, there is an after-party for participants at Smith Commons with old-school punches, small plates, live music and vaudeville acts. This event runs from 4 to 10, but be warned: You must purchase a ticket ($15) in advance, because space is limited.