Through the ’80s, the Dead’s annual three-night weekend at Berkeley’s Greek Theatre became a singular tradition with staggered start times—Friday shows beginning at 7 p.m. (played entirely in darkness), Saturdays at 5 (played through sunset), and Sundays at 3 (played in full daylight). This year, the stage is framed by a pair of rainbows dotted with high-stepping skeletons. The second set opens with a fun new sequence for summer ’84, both party trick and party starter, sending “Scarlet Begonias” into “Touch Of Grey” before going elsewhere, tonight resolving into the expected “Fire On The Mountain,” the fullest iteration so far.