Boston Natural Areas Network and the Boston Urban Forest Council, invite you and your family to join local tree experts for a beautiful fall foliage foray. Join the group as they as amble through the colorful trees found in the Cedar Grove Cemetery in Dorchester and learn about the science of autumn and why trees change color. The walk is co-sponsored in partnership with Cedar Grove Cemetery. Meet on Sat., October 20, at 10 a.m. at the Cedar Grove Cemetery entrance located at 920 Adams Street, Dorchester. The walk is offered free of charge to anyone interested in learning more about local trees. Contact BNAN at 617-542-7696 ext.20 or mathew@bostonnatural.org.