The sixth annual Bluegrass for the Greenbelt Festival, to be held June 4th at the Dunsmuir-Hellman Estate in Oakland, announced its lineup this weekend. Among the acts to perform are Marley's Ghost, The Kathy Kallick Band, Laurie Lewis & the Right Hands, Jimmie Dale Gilmore with The Wronglers, plus The Tuttles with AJ Lee and Arann Harris and The Farm Band. Proceeds from the event benefit the Greenbelt Alliance, which works to protect the area's natural habitat and farms and to create more sustainable cities. Tickets for the family-friendly event are on sale now. $25 until May 13. After that, $30 in advance or $40 at the door. Kids under 12 are free. Tickets can be purchased here.