Since 1970, Earth day has aimed to raise awareness about the natural environment. Luckily, it can be both fun and informative thanks to the annual Ann Arbor Earth Day Festival, hosted by the Leslie Science Nature Center. Featuring more than 50 local, nonprofit environmental organizations, this family-friendly event is perfect for those who would like to participate in a wide array of hands-on activities, explore educational displays and listen to some earth-friendly tunes. Also, don't forget to dress up as your favorite plant or animal to participate in the All Species Parade. Pre-registration is not a requirement. 12-4pm. Free. Leslie Science & Nature Center, 1831 Traver Rd., Ann Arbor. 734-997-1553. www.LeslieSNC.org