Merce Cunningham at 90 Apr 16 at 7pm* Apr 17 & 18 at 7:30pm Apr 19 at 3pm *BAM Spring Gala BAM Howard Gilman Opera House Running time: 90min with intermission Subscription tickets: $20, 36, 52, 60 (Full price: $25, 45, 65, 75) Tickets for Merce Cunningham at 90 go on Private Sale today for…