Friday, May 17, 10 a.m. to 2 p.m. — Drop by, or spend the day at the U.S. Botanic Garden (USBG) to see more than 20 booths focusing on endangered plants and plant conservation. There will also be tours of the U.S. Botanic Garden's endangered species and native plant collections, children's activities focusing on endangered plants and pollinators and inspiring activities that you can do at home to protect the planet.