Rock the Green, a nonprofit with a mission to educate and empower communities to live sustainably, welcomes Ben Harper & The Innocent Criminals to headline the fourth Rock the Green sustainability festival, from 2 to 11 p.m., on September 9, at Reed Street Yards, in Milwaukee, Wisconsin. The musical group has received Gold and Platinum certifications overseas for their eclectic mix of blues, folk, soul, reggae and rock music.

“We are thrilled to have such iconic artists as Ben Harper & The Innocent Criminals headlining the main stage this year,” says Lindsay Stevens Gardner, founder and executive director of Rock the Green. “Ben is a well-known environmental activist whose beliefs align perfectly with Rock the Green’s mission to educate the community and empower its members to take actionable steps that result in sustainable living.”

Other musicians performing at this year’s festival include Barns Courtney, Mondo Cozmo, Baio, Reyna, and Evan Christian on the main stage; and Girls Rock Milwaukee, Devil Met Contention, Klassik, and D’Amato on the Pedal Power Stage. Returning highlights to the festival include the Eco-Kids Stage with interactive children’s activities; locally grown, sustainable and healthy cuisine in the Farm to Fork area; and a gathering of 18 local environmental nonprofits in the Eco-Champs space.

Rock the Green is a Travel Green-certified event and has been recognized as one of the greenest music festivals in the world by the UK-based nonprofit organization, A Greener Festival. Last year the festival’s zero-waste efforts set a new record by diverting 90 percent of the event’s waste from landfills.

Cost: $50; Free kids 10 and under; $100 VIP admission. Location: 222 S. 3rd St., Milwaukee, WI. For more information, visit RockTheGreen.com.