Bob Weir sat in with Jorma Kaukonen and Barry Mitterhoff at Mill Valley, CA’s Sweetwater Music Hall last night. The Grateful Dead/Furthur guitarist joined the Hot Tuna players near the end of their acoustic set for “Death Don’t Have No Mercy” and “I Know You Rider.” Weir met Kaukonen when he was a teenager, before he actually met Jerry Garcia. He also appears on Hot Tuna’s Live at Sweetwater album.

Kaukonen and Mitterhoff will perform at Arcata, CA’s Arcata Theater this evening.