John Oates, Trombone Shorty, Nicki Bluhm, Jon Cleary, Full House star John Stamos, The Office co-star Craig Robinson and many others joined Ivan Neville’s Dumpstaphunk during a SuperJam tied to San Francisco, CA’s Outside Lands festival last night. The all-star jam took place at the Independent shortly after the weekend’s festivities at Gold Gate Park came to a close.

Stamos and Robinson, both of whom are musicians as well as actors, introduced Dumpstaphunk at the start of the night, and kicked off a series of big name guests. Previously announced guests Oates and Cleary performed with Dumpstaphunk throughout the evening, focusing on a mixture of funk classics bu the likes of Allen Toussaint, Sly Stone and others. Oates—who took part in a similar SuperJam at Outside Lands’ sister event Bonnaroo in June—has slowly worked his way into the jamband scene through sit ins with Umphrey’s McGee, moe., My Morning Jacket and numerous acts aboard Jam Cruise. Last night’s loose, improvisational performance took place a few hours after he performed at Outside Lands with his longtime musical partner Daryl Hall.

A number of unannounced guests sat in during the show, too. Rising Bay Area star Nicki Bluhm sang and played kazoo on Hall & Oates’ fourth number one hit, ““I Can’t Go for That (No Can Do).” The song had double meaning since Bluhm scored her first internet buzz thanks to a YouTube cover of the song she recorded with her band the Gramblers as part of her Van Sessions video series. In addition, Lukas Nelson, who jammed with his father Willie and Bob Weir early in the day, sat in and fellow New Orleans star Trombone Shorty joined in on a few songs. The performance stretched deep into the early morning hours.