Butler County Historical Society’s Senator Walter Lowrie House Museum presents the last public showing of “The Civil War in Pennsylvania,” a 500-square-foot exhibit featuring four life-size historic figures, modular panels describing Pennsylvania’s contributions, and original items from the collections of the historical society. Display dates run through Nov. 20, with hours of 10 a.m. to 4 p.m. Thursdays, Fridays, Saturdays and Sundays, and Dec. 2 to 19, with hours from 10 a.m. to 4 p.m. Wednesdays, Thursdays, Fridays and Saturdays. Admission is free, though donations are accepted. Call 724-283-8116 or visit www.butlerhistory.com.

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Carnegie Science Center, North Side, along with the Pittsburgh Glass Center, will host a 21-plus Night from 6 to 10 p.m. Friday. Guests will be able to craft their own fused-glass tile in a glass workshop for an add-on price. Live music also is planned. Call 412-237-3400 or visit CarnegieScienceCenter.org. The center will be closed Sunday.

Children’s Museum, Allegheny Square, hosts its 16th annual Mister Rogers’ Neighborhood Sweater Drive through Dec. 15. The display “Voyage to Vietnam: Celebrating the Tet Festival” continues through Jan. 17. The museum is open 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., Oakland, presents “Out of This World! Jewelry in the Space Age” and the interactive exhibit “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.