On August 1, what would have been Jerry Garcia’s 75th birthday, Colorado’s Red Rocks Amphitheatre is hosting a special concert tribute to the late Grateful Dead guitarist, and more musicians have been added to the all-star lineup, including Anders Osborne and members of The Infamous Stringdusters.

Osborne and the Stringdusters’ Chris Pandolfi and Travis Book will join Sandy Rothman and Kenny Kosek, former members of the Jerry Garcia Acoustic Band, for a collaboration dubbed The Jerry Garcia 75th Birthday Acoustic Band.

That group will join the previously announced lineup of Bob Weir & The Campfire Band and The Jerry Garcia 75th Birthday Band, featuring longtime Garcia collaborators Melvin Seals, Jackie LaBranch and Gloria Jones as well as Oteil Burbridge, Kamasi Washington, Tom Hamilton and Duane Trucks. More artists are expected to be added.

Ticketing information on the event is available here.