Yosemite National Park will be celebrating Earth Day, National Junior Ranger Day, National Park Week, and John Muir’s Birthday on Saturday, April 20, 2019. There will be activities for all ages throughout the day. All activities are free. https://www.nps.gov/yose/learn/news/yosemite-national-park-to-celebrate-earth-day-on-saturday-april-20-2019.htm