The Mercer Island High School Drama production of “Once Upon A Mattress” opened on Nov. 12. The play will run Nov. 13-14 and Nov. 19-21 at 7 p.m. with additional Saturday matinees at 2 p.m. Mercer Island School District students gain free admission with their ASB cards on Saturday matinees. For tickets, visit: https://cur8.com/19957/project/141834. Back row from left to right: Mirabelle Krafcik, Leisel Miller, Bryanna Peterson, Jack Largo, Cole …