COUNTYButler Ghost Walk will take place at 7:30 p.m. today and Saturday beginning in Diamond Park. The event takes spectators on a 60-minute guided walking tour. Participants will hear about the ghosts from Butler’s historic past through tour guide Bill May’s stories of Sam Mohawk, Ghosts of the Old Hospital, The Haunted Elevator, The Chinese Laundry Murder, and the Phantom Civil War Regiment, among others. Reservations are required and can be made by calling 724-256-9026 or sending e-mail to butlerghostwalk@gmail.com. Cost is $10 per person. All children under 18 must be accompanied by an adult.Butler County Historical Society’s Senator Walter Lowrie House Museum isclosed for October to set up for a Civil War in Pennsylvania exhibit. Call 724-283-8116 or visit www.butlerhistory.com.

PITTSBURGHNational Aviary, 700 Arch St., features creatures of the night at Owl-O-Ween, its annual harvest festival celebration, from 11 a.m. to 3 p.m. Saturday. Call 412-258-9445 to register. The Wings & Wildlife Art Show and Marketplace returns Nov. 7 and 8. Aviary hours are 10 a.m. to 5 p.m. daily. Admission is $14 for adults, $13 for senior citizens and $12 for children ages 2 to 18; shows are extra. Visit www.aviary.org.Carnegie Science Center, North Side, hosts the fourth annual Great Pumpkin Smash on Nov. 7. Visitors can roll their leftover jack-o-lanterns off the science center’s roof, as well as take part in other activities, from 10 a.m. to 5 p.m., rain or shine. Hours are 10 a.m. to 7 p.m. Saturdays and 10 a.m. to 5 p.m. Sundays through Fridays. General admission is $18.95 for adults and $11.95 for children ages 3 to 12. Visit CarnegieScienceCenter.org. The center is closed Sunday.Heinz History Center, 1212 Smallman St., presents the “We Can Do It!” WWII exhibition. Center admission is $15 for adults, $13 for seniors, and $6 for children ages 6 to 17. Admission for active and retired military is $6. Visit www.heinzhistorycenter.org.Children’s Museum, Allegheny Square, is hosting “Voyage to Vietnam: Celebrating the Tet Festival.” Museum hours are 10 a.m. to 5 p.m. daily. Admission is $14 for adults and $13 for children ages 2 to 18 and senior citizens. Visit www.pittsburghkids.org.Carnegie Museum of Natural History, 4400 Forbes Ave., is presenting “Out of This World! Jewelry in the Space Age” and “Animal Secrets.” Admission is $19.95 for adults, $14.95 for senior citizens, and $11.95 for children ages 3 to 18. Visit www.carnegiemnh.org.