The Gladwin County Master Gardeners group has scheduled an Earth Day celebration "Invest in Our Planet" from 4:30 p.m. - 7:30 p.m. Thursday, April 20, in the cafeteria of Gladwin High School. * 6 Educational Speakers - 3 classes each (5:30pm, 6:15pm, and 7pm) * Vendors & Giveaways * Each family will be able to take home a free sapling while supplies last Join our Earth Day celebration and see what we as a community can do to make Gladwin…