Designer Wes Wilson, who died on January 24, 2020, at age 82, created some of the most memorable posters of the psychedelic era. These wavy-gravy, acid-colored, hand-lettered provocations for the eye accompanied rock shows at San Francisco’s Fillmore Auditorium and Avalon Ballroom. Wilson’s posters for the Grateful Dead, Jefferson Airplane, The Association, and other bands