_via the band’s Facebook_

On Halloween night, Dumpstaphunk closed out their two-night run at Sweetwater Music Hall in Mill Valley, CA, with a couple of special guests in venue proprietor Bob Weir and their former drummer Nikki Glaspie, who parted ways with the band in 2014 to focus on her work with The Nth Power.

As OffBeat reports, Weir joined the band for a cover of Earl King’s “Big Chief,” along with the Grateful Dead’s “Shakedown Street.” Glaspie also helped out at points throughout the night.

Watch videos of both Weir sit ins below, along with a video of Glaspie and the band covering Led Zeppelin’s “Ramble On,” all from Dumpstaphunk’s Facebook page.