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Dates: April 26 & 27, 2014Times both days: 9am-6pmFree of charge and open to all ages!See our FAQ's to get all your questions answered.Pre-register now for a chance to win prizes.Take our survey to tell us about your Expo experience.View Expo Map OR Download full Expo Program OR View the April 23rd Washington Post Supplement.Download the Layar App prior to going to the Expo to take advantage of our augmented reality features AND Download the free "2014 Lockheed Martin USASEF" mobile app.We still need Volunteers: click here to find out more!We strongly suggest to use public transportation. The Green and Yellow line Mt. Vernon Square/7th St Convention Center Metro Stop exits into the Convention Center. Click here to view interactive Metro map. 3000 fun, hands-on activities for all ages (create your personal list of exhibits here) and over 150 stage shows, including music, magic, comedy and more (create your personal Stage Show Schedule here), a Career and College Fair for high-school students and a Book Fair with over 25 Featured Authors. Lockheed Martin has created a free mobile app which provides students with a virtual passport to journey through the exciting technologies and hands-on demonstrations within Lockheed Martin's 56,000 square foot exhibit space.