Comtra Theatre, Route 19 in Cranberry Township, is presenting "The Hollow," a drama, from Friday through Nov. 7. 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 Public Theater</B> opens its 35th season with "Ella," the biomusical about Ella Fitzgerald, known as The First Lady of Song. "Ella," which includes 23 hits, runs through Nov. 1 at the O'Reilly Theater, 621 Penn Ave. The show goes on at 8 p.m. Tuesdays through Saturdays (except Tuesday when the show will begin at 7 p.m.); at 2 p.m. Saturdays and Sundays; and at 7 p.m. Sundays (but not Nov. 1). Tickets range from $40 to $60; students and those age 26 and younger pay $15. For tickets call 412-316-1600 or visit www.ppt.org.<B>CLO Cabaret</B> is showing "Forever Plaid" through March 28 at the CLO Cabaret at Theater Square, 655 Penn Ave. "The Plaids" is the story of a 1950s all-male singing group. Tickets are $39.50 for Wednesday, Thursday and Friday evenings, $44.50 for Saturday evenings, and $34.50 for matinees. Call 412-456-6666.

<B>New Castle Playhouse</B>, 212 E. Long Ave., New Castle, is staging "I Love You, You're Perfect, Now Change" through Nov. 1. Shows start at 7:30 p.m. Fridays and Saturdays and at 2 p.m. Sundays. Tickets are $10. Call 724-654-3437 or visit www.newcastleplayhouse.org.<B>Wexford Acting Studio</B> is staging Ahern and Flaherty's production of the musical "Seussical Jr." at 2 p.m. Saturday at North Allegheny's Carson Middle School, 200 Hillvue Lane. Students involved in this production range in age from 6 to 18, including some from Mars and Seneca Valley school districts. Tickets are $16 each. Visit the Web site, www.WexfordActingStudio.com.