The plaza behind San Jose City Hall was filled with Deadheads and DJs on Thursday night, as the city distinctively celebrated its historic connection to the Grateful Dead by illuminating City Hall in light show of swirling colors, with the legendary band’s music ringing out in the courtyard.

The festivities marked the 60th anniversary of a momentous night when the band, just having changed its name from the Warlocks, played an LSD-fueled “acid test” at a house on South Fifth Street on Dec. 4, 1965. In the intervening 60 years, the house was moved to make way for City Hall, but a plaque commemorating the spot was unveiled Thursday night. Featuring the band’s famous “Steal Your Face” logo, the plaque will be permanently affixed to the wing’s south wall.

“There’s no acid test tonight, but I

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