Harmony Museum, Mercer Street in Harmony, will have its annual Harmoniefest dinner and program Feb. 16 in Stewart Hall, 218 Mercer St. The evening will include an illustrated presentation by authors of the recently published “The Civil War in Pennsylvania: A Photographic History.” Books will be available for purchase and signing. Reservations are required by Feb. 8. Call 724-452-7341 or visit www.harmonymuseum.org.

A 28-foot-by-16-foot HO model railroad display will be running from 12:30 p.m. to 5 p.m. Saturdays and Sundays until the end of January at Donaldson Motors, 714 River Ave., Emlenton. Call 724-867-2293.

Phipps Conservatory and Botanical Gardens will open the orchid and tropical bonsai show on Saturday and continue it through Feb. 24. Hours are 9:30 a.m. to 5 p.m. daily and until 10 p.m. on Fridays. Admission is $15 for adults, $14 for senior citizens and students, and $11 for children ages 2 to 18. Members and children younger than 2 enter for free. Call 412-622-6914 or visit phipps.conservatory.org.The Holocaust Center of Pittsburgh and the August Wilson Center have partnered to present “The Nazi Olympics: Berlin 1936” through Feb. 28 at the Wilson Center, 980 Liberty Ave. For tickets, call 412-421-1500, Ext. 106, or visit www.AugustWilsonCenter.org.Children's Museum, 10 Children's Way, Allegheny Square, hosts “Obscure Games: Game On!” from 1 to 3 p.m. Saturday. “Tough Art” exhibit concludes Sunday. “Missing Links (The Rainbow Jumpy)” continues through Feb. 3. 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.Heinz History Center, 1212 Smallman St., is showing “From Slavery to Freedom,” a long-term exhibit highlighting the history of the anti-slavery movement, the Underground Railroad, and the impact of 19th century activism on the modern quest for civil and human rights in Pittsburgh. Hours are 10 a.m. to 5 p.m. daily. Admission is $15 for adults, $13 for visitors age 62 and older, $10 for students and children ages 6 to 17, and free for children 5 and younger. Call 412-454-6000 or visit www.heinzhistorycenter.org.Carnegie Science Center, North Side, presents Spaceplace, a permanent exhibit featuring a two-story walk-in replica of the International Space Station, scale model of the Hubble telescope, and a weightlessness experience. Admission is $17.95 for adults and $11.95 for children ages 3 to 12. Call 412-237-3400 or visit CarnegieScienceCenter.org. Hours are 10 a.m. to 7 p.m. Saturdays and 10 a.m. to 5 p.m. Sundays through Fridays.