Butler County Civil War Roundtable will sponsor its third annual Downtown Butler Ghost Walk at 7:30 p.m. Friday and Saturday. This 60-minute event will begin in Diamond Park. The guided tour will include the park and adjacent Main Street business district. Ghost stories from Butler's historic past to be discussed include Sam Mohawk, The Biddle Boys/Mrs. Soffel, The Headless Man, Chinese Laundry Murder, and the Phantom Civil War Regiment, among others. Children under 18 must be accompanied by an adult. Cost is $10. Reservations are required by calling 724-256-9026.

Harmony Museum, 218 Mercer St., Harmony, offers guided tours from 1 to 4 p.m. daily except Mondays. Admission is $7 for adults, $6 for senior citizens, and $3 for youths ages 6 to 17. Call 724-452-7341 or visit www.harmonymuseum.org.

Drake Well Museum, 202 Museum Lane, Titusville, will be the site of “A gathering of Oil Historians — Present and Future” from 1 to 4 p.m. Saturday. Admission is free and light refreshments will be provided. To reserve a spot, call 814-827-2797 or e-mail drakewell@verizon.com.

Phipps Conservatory and Botanical Gardens, 1 Schenley Park, offers free admission Monday thanks to a grant from the Jack Buncher Foundation. Between 9:30 a.m. and 5 p.m. that day, guests can enjoy the fall flower show and garden railroad. Call 412-622-6914 or visit phipps.conservatory.org.Heinz History Center, 1212 Smallman St., is hosting the national launch of “Their Life's Work: The Brotherhood of the 1970s Pittsburgh Steelers, Then and Now,” written by Gary Pomerantz. As part of the special launch event at 6 p.m. Wednesday, Steelers greats Franco Harris, Rocky Bleier, Andy Russell and Dan Rooney will discuss stories from the new book as part of an all-star panel moderated by the author. Following the discussion, visitors will be able to buy signed copies of the book. Tickets are $20 for the general public and $10 for history center members. Call 888-718-4253.Carnegie Science Center, North Side, is hosting the annual ChemFest celebration from 10 a.m. to 3 p.m. Friday and Saturday. This year's theme “Energy: Now and Forever!” will have dozens of hands-on exhibits and demonstrations presented by local companies. Science center admission is $17.95 for adults and $11.95 for children ages 3 to 12. Call 412-237-3400 or visit CarnegieScienceCenter.org.National Aviary, 700 Arch St., hosts the interactive free-flight show “Beaks!” daily at 11 a.m. and 3 p.m. through Jan. 1. The show features hyacinth and scarlet macaws, a flamingo, and southern ground and trumpeter hornbills. The show is $5 in addition to the regular cost of admission, which is $13 for adults, $12 for senior citizens, $11 for children ages 2 to 18, and free for children younger than 2. Aviary hours are 10 a.m. to 5 p.m. daily. Call 412-323-7235 or visit www.aviary.org.ToonSeum, Pittsburgh's Museum of Cartoon Art at 945 Liberty Ave., celebrates the 40th anniversary of “Hagar the Horrible” through Dec. 1. Museum hours are 10 a.m. to 3 p.m. Mondays, Wednesdays, Thursdays and Sundays and 10 a.m. to 5 p.m. Fridays and Saturdays. Admission is $1 for children ages 6 to 12 and $5 for adults. Call 412-232-0199 or visit www.toonseum.org.Children's Museum, 10 Children's Way, Allegheny Square, has opened TapeScape, a massive indoor landscape made of 360 rolls (that's 22 miles) of packing tape. “Tough Art” continues through Dec. 31. Hours are 10 a.m. to 5 p.m. daily. Admission is $13 for adults, $12 for children ages 2 to 18 and senior citizens, and free for children younger than 2. Call 412-322-5058 or visit www.pittsburghkids.org.Carnegie Museum of Natural History, 4400 Forbes Ave., Oakland, presents “Roads of Arabia: Archaeology and History of the Kingdom of Saudi Arabia” through Nov. 3. Hours are 10 a.m. to 5 p.m. Tuesdays to Saturdays, with extended hours until 8 p.m. Thursdays, and noon to 5 p.m. Sundays. Admission is $17.95 for adults, $14.95 for senior citizens, and $11.95 for students and children ages 3 to 18. Admission after 4 p.m. Thursdays is discounted. Call 412-622-3131 or visit www.carnegiemnh.org.