Step into the future of aviation and space exploration with NASA at the USA Science and Engineering Festival on Saturday, April 7, and Sunday, April 8, at the Walter E. Washington Convention Center in Washington. Leading up to the main event, NASA will hold a media availability at 12:30 p.m. EDT Friday, April 6, with Step into the future of aviation and space exploration with NASA at the USA Science and Engineering Festival on Saturday, April 7, and Sunday, April 8, at the Walter E. Washington Convention Center in Washington. Leading up to the main event, NASA will hold a media availability at 12:30 p.m. EDT Friday, April 6, with