Knoch High School presents its fall play “Twentieth Century” at 7:30 p.m. Friday and Saturday at the high school in Jefferson Township. Admission is $5. E-mail bronderj@southbutler.net or call 724-352-1700, Ext. 4305.

Murder mystery dinner show “Lethal Luau” will be presented at 5:30 p.m. Saturday at Saxonburg Memorial Presbyterian Church, 100 E. Main St., Saxonburg. Tickets to the dinner and show put on by youths are available in advance only and cost $15 per person or $25 per couple. Call 724-352-2888.

Comtra Theatre, Route 19 in Cranberry Township, presents the heartwarming comedy “Sylvia” through Saturday. “A Christmas Carol” will run Nov. 25 to Dec. 17. Curtain is at 7:30 p.m. Fridays and Saturdays. Tickets are $12 for “Sylvia” and $15 for “A Christmas Carol.” Call 724-773-9896.

<B>New Castle Playhouse</B>, 212 E. Long Ave. in New Castle, presents the musical “The Wizard of Oz” through Dec. 4. Curtain is at 7:30 p.m. Fridays and Saturdays and at 2 p.m. Sundays. Tickets range from $10 to $15. Call 724-654-3437.

<B>“Dr. Seuss' How the Grinch Stole Christmas! The Musical,” </B>presented by PNC Broadway Across America-Pittsburgh, will run Tuesday through Nov. 27 at the Benedum Center, 719 Liberty Ave. Tickets range from $20 to $67. Call 412-456-6666.<B>“A Class Act,”</B> a musical biography of Ed Kleban, Tony Award-winning lyricist of “A Chorus Line,” is being staged as a fundraiser through Sunday at the Grey Box Theatre, 3595 Butler St. Curtain is at 8 p.m. today through Saturday and at 2 p.m. Saturday and Sunday. Tickets are $20, with 20 percent of each ticket going to St. Jude Children's Research Hospital. Food items will be collected for the Greater Pittsburgh Community Food Bank, which distributes in Butler County. Call 412-576-0898 or visit the website www.QMproductionsinc.com.<B></B>