BRADY TWP — The Old Stone House hosts an open house from 5 to 8 p.m. Dec. 15 giving visitors the chance to see how early Americans celebrated Christmas. Donations of $3 per person or $5 per family will be accepted. For information, visit www.oldstonehousePA.org.

SLIPPERY ROCK — A Slippery Rock Christmas dinner theater begins at 5:45 p.m. Dec. 15 at Highland Presbyterian Church, 310 Franklin St.The free dinner includes lasagna, salad, bread and pie. The show is an old time radio show of Dorothy Sayers' play, “He That Should Come.”The dinner/show is being hosted by Grace Anglican Church. There will be childcare provided during the play for children 5 and younger.To make reservations, call 724-421-9362 or send e-mail to ChristmasDinnerTheater@gmail.com.

PITTSBURGH — Music in a Great Space, the concert series at Shadyside Presbyterian Church, presents Handel's “Messiah,” at 4 p.m. Sunday.Tickets are $10 for adults and $5 for senior citizens and students. For information, call 412-682-4300 or visit www.shadysidepres.org. Shadyside Presbyterian is at the corner of Amberson Avenue and Westminster Place.

GIBSONIA— “Rat Pack Christmas” will be presented at 8 p.m. Saturday at the Kean Theatre, 5847 Meridian Road.Frank Sinatra, Dean Martin and Sammy Davis Jr. impersonators bring a Vegas style to this show of holiday favorites.Cost is $30.A dinner on-site is available at 6:30 p.m. before each show; cost for dinner and the show is $52. For tickets, call 724-444-5326 or visit www.KeanTheatre.com.