Sam, played by Claire Gudorf, sings "Holly Jolly Christmas" during a dress rehearsal for Celina Middle School's "Rudolph the Red-Nosed Reindeer Jr." on Tuesday. Performances are at 7:30 p.m. Friday and Saturday and 3 p.m. Sunday at the Celina Education Complex. All ticket sales are online and available at hometownticketing.com after searching Celina Middle School. Tickets are $8.