NASA Earth Day in DC, Apr 20, 2017, DC
20-Apr-2017 through 20-Apr-2017NASA will hold activities on April 20, 2017 at Union Station in Washington, DC in conjunction with Earth Day. From 9:00 am - 5:00 pm ET, NASA Hyperwall and Science stories, hands-on activities and demonstrations will take place. NASA scientists will give talks after the opening ceremony at 10:30 am ET. Former astronaut Scott Altman will be available from 12:00-1:00 pm ET.
That and other Earth Day-related NASA activities are summarized in an April 17, 2017 NASA press release.
Earth Day itself is April 22. Separately from NASA, a March for Science rally will take place on the National Mall in Washington, DC. Other rallies will be held around the world.