The Earth Day Festival and Parade takes place from 9 a.m. to 2 p.m., Saturday, April 16. The event includes a parade at 10 a.m., hands-on activities, many exhibits about a range of environmental concerns, an alternative-fuel vehicle show and a solar competition. Free. Valet bicycle parking provided. Visit tucsonearthday.org, or call 206-8814 for more information.