Wavy Gravy’s 75th Birthday (Concert)

Wavy Gravy’s 75th Birthday The political activist Wavy Gravy — famous for his role as master of ceremonies at the original Woodstock — is hosting a benefit for the Seva Foundation (a California-based nonprofit working toward “sustainable solutions to poverty and disease”) that doubles as a 75th birthday party. A slew of mostly folk-minded musicians will perform, including Jackson Browne, Crosby & Nash, Ani DiFranco, Dr. John, Steve Earle, Bruce Hornsby, Jorma Kaukonen, Steve Kimock, Allison Moorer, Buffy Sainte-Marie and more. At 8 p.m., Beacon Theater, 2124 Broadway, at 74th Street , (800) 745-3000, beacontheatrenyc.com; $54.50 to $204.50. (Petrusich)