Pen, Paint, and Pretzels, the umbrella organization for student-run performing arts groups at Tufts University, presents the second of three performances of  “Noises Off,” its spring semester Main Stage show. A raucous and hilarious 1982 farce by the English playwright Michael Frayn, the Tufts production is directed by Ana Muniz Rodriguez and Juliet Baker. Free general admission; no tickets required. The final performance will be at 3 p.m. on Sunday, April 6.