Colorados Earthfest Boulder take place this coming Saturday, April 18, in Cu Research Park. The day-long event will offer a mix of activities, including the EarthDay5k, the 5th Annual Dirt Day Adventure Challenge and Expo, a Short Track Mountainbike Race and the Kids and Adults Cruiser Parade. Following the days festivities, Bill Nershi will headline Earthfest Boulders official after party at the nearby Boulder Theatre. Nershi will perform with the new ensemble Blue Planet that feature Keith Moseley (String Cheese Incident), Jeff Sipe (Leftover Salmon), Erik Deutsch (Charlie Hunter) and Nick Forster (Hot Rize, E-Town). Elephant Revival will supply opening duties.