Butler County Historical Society presents the “Echoes from Our Past Historic Cemetery Walk,” featuring six actors portraying people from the area's past, at 2 p.m. Saturday and Sunday at the grounds of the North Side Cemetery, 1002 N. Main St. Tickets are $14 for adults and $10 for students ages 10 to 21. Visit the society office at the Sen. Walter Lowrie House, 123 W. Diamond St., from 11 a.m. to 2 p.m. Tuesdays and Thursdays and 11 a.m. to 4 p.m. Wednesdays. The office will also be open from 11 a.m. to 2 p.m. Friday. Call 724-283-8116 or visit www.butlerhistory.com.

Portersville Steam Show hosts its Spring Gas-Up on Saturday and Sunday at the steam show grounds, 1512 Perry Highway. The gates will open at 9 a.m. both days, and the bluegrass band Bits 'n Pieces will play at 4 p.m. Saturday. Attractions include antique cars, crafts, steam engines and saw milling. Admission is $5 for adults and free for children 11 and younger.

Maridon Museum, 322 N. McKean St., is open from 11 a.m. to 4 p.m. Wednesdays through Saturdays. Admission is $4 for adults, $3 for senior citizens and students, and free for children younger than 8 accompanied by an adult. Call 724-282-0123 or visit www.maridon.org.

Children's Museum, Allegheny Square, will open “Very Eric Carle” May 25. Museum Lab is a new exhibit for children age 10 and older that includes Studio Lab, Make Lab and Tech Lab. The museum will be closed Memorial Day. Regular hours are 10 a.m. to 5 p.m. daily. Admission is $16 for adults and $14 for children ages 2 to 18 and senior citizens. Call 412-322-5058.Heinz History Center, 1212 Smallman St., will host an Italian genealogy workshop from 9 a.m. to 4:30 p.m. Saturday. Registration is $40; register online at www.heinzhistorycenter.org/events.Carnegie Science Center, North Side, features a “Summer of Space” including the premiere of the film “Apollo 11: First Steps Edition” on Friday. “Da Vinci The Exhibition” continues through Sept. 2, and has its own admission price. Center hours are 10 a.m. to 5 p.m. Admission is $19.95 for adults, $14.95 for senior citizens and $11.95 for children; some activities are extra. Call 412-237-3400.