John Mayer commemorated the one-year anniversary of Dead & Company’s shows at San Francisco’s Golden Gate Park — the last time late guitarist Bob Weir performed onstage. “Today marks a year since Dead & Company played our last of three shows in Golden Gate Park helping to celebrate 60 years of Grateful Dead,” Mayer wrote on Instagram. “Bobby Weir, ever the contrarian, laid down his ultimate act of defiance; he was going to play these shows on his terms,” he added. “The man you loved, whose music has given a more expansive inner life to us all, never backed down,” he wrote. “In his final shows, after 60 years, he lived up to every measure of a person he’d ever stood for.