Slightly Stoopid and Friends will play at Bob Weir’s TRI Studios on April 21, and the performance will be available as a free live webcast through Qello Concerts.

The “Live at Roberto’s TRI Studios” webcast will start at 7pm PT at Weir’s San Rafael, CA, studio space, where the Grateful Dead guitarist will sit in with the band, along with special guests Karl Denson, Fishbone’s Angelo moore, Marlon Asher and Roger Rivas. Actor Peter Dante will host the event.

Below, watch a video of Weir playing “Ocean” with Slightly Stoopid the last time the band came through TRI. The 2011 performance will also be streamed live via Qello Concerts all day on April 20.