Yosemite National Park is hosting a special Earth Day Festival on Saturday, April 23, 2016 from 10 a.m. to 3 p.m. in front of the Yosemite Valley Visitor Center. The public is encouraged to attend the Festival this year which honors the Centennial of the National Park Service. Park admission is free because of National Park Week and all activities at the Earth Day Festival are free of charge. https://www.nps.gov/yose/learn/news/public-invited-to-earth-day-festival-at-yosemite-national-park-on-saturday-april-23-2016.htm
Source: Yosemite National Park News