Trackside has started off the summer hosting  51 teen performers who have been practicing six hours a day for their big summer show. The Wilton Children’s Theatre will present ‘The Wedding Singer,’ a musical comedy, at Wilton High School’s Clune Center, July 11-12, at 7:30 p.m. ‘It is great having these young artists rehearse at the teen center,’ said Mark Ketley, executive director of Trackside. “Watching and listening to them as they prepare for a great musical is very exciting.” Tickets are $12 and may be purchased by calling 203-232-5639 or by going to wiltonchildrenstheatre.org.