Neil Simon's comedy "The Odd Couple" will be performed Friday and Saturday and Nov. 14 and 15 in the Bergman Events Center of St. Gregory School, 115 Pine St. This is a professional show with ticket prices including hors d'oeuvres, dessert and beverages for the over-21 attendants. Doors open at 7 p.m. each night, and show starts at 8 p.m. Tickets are available for $25 for a single, $45 for a couple, and $20 for a senior citizen. For reservations, call Jeanne Marino at 724-432-2300. All proceeds benefit St. Gregory School.

Comtra Theatre, Route 19 in Cranberry Township, is staging the Agatha Christie melodrama "The Mousetrap" through Saturday at the theater on Route 19. The next show will be "Tom Sawyer's Treasure Hunt" running from Nov. 14 to 29. Curtain is at 7:30 p.m. Fridays and Saturdays. Admission is $12 for plays and $15 for musicals. Box office opens at 6:45 p.m. the day of the show. Call 724-773-9896.

<B>Pittsburgh Musical Theater's</B> Richard E. Rauh Conservatory Theater Company presents Rodgers and Hammerstein's "Cinderella" through Sunday at the Byham Theater, 101 Sixth St., featuring students Nicole Uram and Lyric Ackelson, both of Butler. Showtimes are 7:30 p.m. Nov. 6 to 8 with matinees at 2 p.m. Nov. 8 and 9. Tickets range from $15 to $25. Call 412-456-6666.<B>"Mama Mia,"</B> the hit musical based on the songs of ABBA, is being staged through Sunday at the Benedum Center, 719 Liberty Ave. Curtain is at 7:30 p.m. Wednesday, at 1 and 7:30 p.m. Nov. 6, at 8 p.m. Nov. 7, at 2 and 8 p.m. Nov. 8, and at 1 and 6:30 p.m. Nov. 9. Tickets range from $23.50 to $66.50 and are available by calling 412-456-6666 or by visiting the Web site, www.pgharts.org.<B>The Backstage Bar and Cabaret at Theater Square</B>, a project of The Pittsburgh Cultural Trust, in Theater Square at 655 Penn Ave., is staging "I Love You, You're Perfect, Now Change, through Feb. 1, 2009, at the CLO Cabaret, 655 Penn Ave. Performances start at 7:30 p.m. Wednesdays through Saturdays, at 2 p.m. Saturdays and Sundays and at 1 p.m. select Thursdays, except some holiday dates in November, December and January. Tickets are $39.50 for evenings or $34.50 for matinees. Call 412-456-6666 or visit the Web site, CLOcabaret.com.

<B>New Castle Playhouse</B>, 202 E. Long Ave. in New Castle, is staging the musical "The Apple Tree" through Sunday. Curtain is at 7:30 p.m. Fridays and Saturdays and at 2 p.m. Sundays. Tickets are $10. Call 724-657-9369 or visit www.newcastleplayhouse.org.