The Richmond Tree Stewards have been hard at work putting on programs every Saturday in April in honor of Arbor Day. Today’s “Tree Academy” is no longer taking any more registrants. But there’s still plenty for tree-lovers to experience on April 21st and 28th. On the 21st there will be a tree walk at 2:15 at the Carillon in Byrd Park as well as one in Bryan Park from 10 a.m. to noon. On the 28th, meet the trees of Capitol Square. Learn about the rain gardens and green street renovations that will reduce stormwater runoff and keep our waters clean. The walk will begin promptly at 10 a.m. at the Bell Tower.