The National Air and Space Museum invites Capitol Hill (and all DC) families to the Time and Navigation Family Day on Saturday, April 20, 2013 from 10 am until 3 pm. The event is free and open to everyone! It is meant to celebrate the gallery opening of Time and Navigation: The untold story of getting from here to there. Throughout the day, there will be musical performances and historical navigator re-enactors. You will also be able to speak with experts on GPS technology, enjoy hands-on activities, and make your own map of the National Mall.
More info here.