Northern Lights Theater Company presents “Lost in Yonkers” at 7:30 p.m. Friday and Saturday and Nov. 8 and 9 in the Mars Public Library community room. Tickets are $15 for adults and $8 for senior citizens and children and are available at the library, 107 Grand Ave.

Sing Hosanna! will present “Shrek the Musical” Nov. 14 to 17 at the Succop Theater at Butler County Community College. Curtain is at 7:30 p.m. Nov. 14, 15 and 16 and at 2 p.m. Nov. 17. Tickets are $15 at May's Music Shoppe, 247 E. Jefferson St. Call 724-287-8362.

Comtra Theatre, Route 19, Cranberry Township, presents “Monty Python's Spamalot” through Nov. 9. Show time is 7:30 p.m. Fridays and Saturdays. Tickets are $15. For reservations, call 724-591-8727 or visit comtraplayers.com.

Armstrong Community Theater will present the play “Vintage Hitchcock — A Live Radio Play” at 7:30 p.m. today through Saturday at the Worthington Civic Center, 214 E. Main St., Worthington. Tickets are $10. Call 724-297-3228 or e-mail info@armstrongcommunitytheater.org.New Castle Playhouse, 212 E. Long Ave., New Castle, is presenting the musical “Tick, Tick ... Boom!” through Sunday. Show times are 7:30 p.m. Friday and Saturday and 2 p.m. Sunday. Tickets are $12. Call 724-654-3437.

Shady Side Academy Senior School presents “An Enemy of the People” at 7 p.m. Friday, 7 and 9:30 p.m. Saturday and 2 p.m. Sunday at the Hillman Center for Performing Arts, 423 Fox Chapel Road. Sophomore Abbie Minard of Valencia is assistant director and head of the writing team. Tickets are $10 for adults and $8 for students and available by calling 412-968-3040.Pittsburgh Public Theater stages “True West” Nov. 7 to Dec. 8 at the O’Reilly Theater, 621 Penn Ave. Tickets are $23 to $55; students and those 26 and younger pay $15.75. Call 412-316-1600.Point Park University Conservatory Theatre Company presents a fresh take on the classic Greek tragedy, “Hecuba” Nov. 8 to 24 in the Studio Theatre at the Pittsburgh Playhouse, 222 Craft Ave. Tickets are $18 to $20. Call 412-392-8000.