The Butler County Historical Society will present “Echoes from Our Past — Historic Cemetery Walk” bringing history to life through costumed actors assuming the characters of Butler County's ancestors Sept. 27 and 28 on the grounds of the North Side Cemetery, 1002 N. Main St. Tour times are 11 a.m. and 2 p.m. Sept. 27 and 2 p.m. Sept. 28. Tickets are $14 for the general public and $10 for historical society members and Butler Little Theatre season ticket holders. Ticket sales end Sept. 24. Call 724-283-8116 or visit butlerhistory.com.

Harmony Museum, 218 Mercer St., Harmony, hosts its annual antique show Sept. 20 and 21 at the museum's 303 Mercer Road barn annex. A Friday evening preview reception has been added this year. Show hours are 10 a.m. to 5 p.m. Sept. 20 and 11 a.m. to 4 p.m. Sept. 21. Admission is $3, and lunch and refreshments will be available. Admission to the preview from 6 to 8 p.m. Sept. 19 is $10. Admission proceeds support museum operations. Call 724-452-7341.

Heinz History Center, 1212 Smallman St., presents its newest long-term exhibition showcasing the local origins and international reach of the Heinz company's 145-year history, including its evolution from a small food purveyor into one of the most recognizable brands. Healthy Heritage Cooking sessions, are planned for 11 a.m. and 12:30 p.m. Saturday. Continuing is “Pittsburgh's Lost Steamboat: Treasures of the Arabia.” Center admission is $15 for adults, $13 for senior citizens age 62 and older, and $6 for students and children ages 6 to 17. Visit www.heinzhistorycenter.org.Carnegie Science Center, North Side, continues the exhibit “Blue!” through Jan. 1. General admission is $17.95 for adults and $11.95 for children ages 3 to 12. On Sunday, “Tech Tours” of the submarine USS Requin will be held from 9 to 11:30 a.m. Participants must be age 15 and older. Cost is $20 for nonmembers. Advance registration is required. Visit carnegiesciencecenter.org.Phipps Conservatory and Botanical Gardens, 700 Frank Curto Drive, hosts the summer flower show until Oct. 5. Conservatory hours are 9:30 a.m. to 5 p.m. daily and until 10 p.m. Fridays. Admission is $15 for adults, $14 for senior citizens and students, and $11 for children ages 2 to 18. Visit phipps.conservatory.org.National Aviary, 700 Arch St., presents “Taking Flight: An Aerial Adventure” daily at 11 a.m. and 2 p.m. outdoors in the rose garden, free with regular admission of $14 for adults, $13 for senior citizens and $12 for children ages 2 to 18. Hours are 10 a.m. to 5 p.m. daily. Visit www.aviary.orgChildren's Museum, Allegheny Square, hosts XOXO: An Exhibit About Love and Forgiveness” through Sept. 21. The annual Tough Art exhibit opens Saturday. Admission is $14 for adults and $13 for children ages 2 to 18 and senior citizens. Children younger than 2 are admitted free. The museum is open 10 a.m. to 5 p.m. daily. Visit www.pittsburghkids.org.ToonSeum, featuring cartoon art, at 945 Liberty Ave., presents “Cartoons are the Best Medicine: The Healing Humor of Dan Piraro,” an exhibition featuring 20 Bizarro cartoons on health and the medical profession, through Nov. 2. Admission is $6 for those over age 13 and $3 for children ages 6 to 12. Senior citizens, college students, veterans and active military pay $5. Visit toonseum.org.Carnegie Museum of Natural History, 4400 Forbes Ave., Oakland, presents “Race: Are We So Different?” through Oct. 27. 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. Visit www.carnegiemnh.org.