This Saturday is the eight annual Become A Pilot family day. This is the one day a year when the National Air and Space Museum Udvar-Hazy (Dulles) Center has actual flying aircraft arrive and the planes (and particularly their pilots) are on display. There's everything from a 1929 Cabin Waco to a C-17 on display and a Cozy and my Navion, etc... Lots of indoor activities (as well as the rest of the museum) in play as well.

http://becomeapilot.si.edu/

I
'll be there along with some of the other forum members.