Bob Weir, Mickey Hart, Phil Lesh and Bill Kreutzman of the Grateful Dead are joined by Trey Anastasio and Bruce Hornsby to celebrate the 50th Anniversary of the Grateful Dead’s first gig. The rainbow appeared during the first show at Levi Stadium in Santa Clara, CA on July 3, 2015. There is a lot of mystique in the Dead community and if you know anything about that culture, everyone in the venue felt the presence of their departed singer Jerry Garcia.