Walking guided tours in and around downtown Butler are being offered. A walking tour of Butler's law offices will be held from 7 to 8:30 p.m. Tuesday, starting from Banner & Sechler, 318 S. Main St. A walking tour of McKean Street will be held from 1:30 to 3 p.m. Sept. 16,with a starting location to be determined. Cost is $10 for adults and $5 for children age 12 and younger. To reserve a spot for a tour, call 724-256-5769 or e-mail info@butlerdowntown.org.

Old Stone House will host a program about what life was like in the late 18th and early 19th centuries from 10 a.m. to 4 p.m. Saturday and Sunday. Reenactors will give demonstrations on animal trapping and trading, tomahawk and knife throwing, blacksmithing and survival skills from the frontier days in Western Pennsylvania. A food tasting of items from the time period will be offered. A $3 per person or $5 per family donation is requested. Old Stone House is at the intersection of Routes 8, 528 and 173. Call 724-738-4964 or 724-738-2409.

Carnegie Science Center, North Side, continues acoustic musical performances in association with the exhibit “Guitar: The Instrument That Rocked the World.” Performing from 2 to 3 p.m. Saturday will be Joe Grushecky of The Houserockers. “Tech Tours” of the USS Requin submarine will take place from 9 to 11 a.m. Sunday as well as July 29, and Aug. 12 and 26. Participants must be 15 or older. Cost is $20 and reservations are required. Admission is $17.95 for adults and $11.95 for children ages 3 to 12. Most activities are included in the admission price, but some, like Omnimax films and the Tech Tours, cost extra. Call 412-237-3400.Fort Pitt Museum in Point State Park will host Summer Saturdays at the Fort programs with reenactors and demonstrations Saturday as well as Aug. 11. Admission is $5 for adults and $3 for children ages 6 to 17. Call 412-454-6415.Phipps Conservatory and Botanical Gardens at One Schenley Park presents its summer flower show “Fountains of Youth” through Sept. 30. Phipps is open daily from 9:30 a.m. to 5 p.m. and until 10 p.m. Fridays. Admission is $12 for adults; $11 for senior citizens and students with ID; $9 for children ages 2 to 18; and free for children younger than 2. Call 412-622-6914 or visit phipps.conservatory.org.Heinz History Center, 1212 Smallman St., is displaying artifacts along with nearly 50 paintings and sketches depicting the lives of Negro League baseball players as part of a new exhibition, “The Story of Negro League Baseball: We Are the Ship,” through Aug. 26. Admission is $10 for adults, $9 for seniors, $5 for students and children ages 6 to 17, and free for children 5 and younger. Call 412-454-6000 or visit www.heinzhistorycenter.org.National Aviary, 700 Arch St., has a burrowing owl exhibit that shows the baseball-sized owls, native to the western United States and South America, in their underground burrows. Also open is “Parrots of the Caribbean” in the Helen M. Schmidt FliteZone Theater. The Sky Deck theater features birds of prey in free-flight demonstrations. The aviary is open daily from 10 a.m. to 5 p.m. Admission is $13 for adults, $12 for senior citizens, $11 for children ages 2 to 18, and free for children younger than 2. Call 412-323-7235 or visit www.aviary.org.Children's Museum, 10 Children's Way, Allegheny Square, presents “The Wizard of Oz Children's Educational Exhibition” through Sept. 2. 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.