Wavy Gravy managed the career of Lenny Bruce and befriended Bob Dylan not long after the young folk singer moved to New York, but the tie-dye-loving counterculture clown remains best known for MCing the original Woodstock music festival. Nearly 50 years later, he’ll spend his 79th birthday hosting another concert: raising funds for earthquake relief in Nepal. The event, which features Edward Sharpe and the Magnetic Zeros, Steve Kimcock, the California Honeydrops and Hot Buttered Rum, will raise money for Seva, an organization Gravy co-founded in 1978. The activist tells Rolling Stone, “A lot of organizations work from the top down. Seva likes to work from the bottom up. I’m so honored and thrilled to even be even a small part of this.”