Courtesy photo. Jennifer Ryder, of Bedford, will play Patty Simcox in the Teen Actorsingers’ production of “Grease.” Pictured with Ryder is Alex Hebert, of Tyngsborough, Mass., as Eugene. Performances will be at 7:30 p.m. Friday, July 20; 2 p.m. and 7:30 p.m. Saturday, July 21; and 2 p.m. Sunday, July 22 at the Janice B. Streeter Theater, 14 Court St., Nashua. Tickets are $15 for adults, $12 for students and seniors, and can be purchased online at actorsingers.org, by calling 320-1870 or at the theater one hour before each show.