Much of an upcoming Adam Sandler film, “Grown Ups 2,’’ will be shot in Marblehead. Filming will begin in May. The production is looking for local children and adults to be in the film as extras, and will hold an open casting call from 10 a.m. to 4 p.m. May 12 and 13 at the Boston Teacher’s Union Hall, 180 Mt. Vernon St., Dorchester. To be considered, applicants should bring a 4 x 6 color photo. For more information, visit sandealessicasting.com.