On Saturday, July 20. walk the Emerald Necklace with Karen Mauney-Brodek, President of the Emerald Necklace Conservancy, This annual event is a 6 mile urban hike, taking walkers from Franklin Park in Dorchester to the mouth of the Muddy River in Charlesgate Park. Meet at the Shattuck Picnic Grove in Franklin Park. Register at www.emeraldnecklace.org