“The Biddle Boys: Escape, Capture and Death of Butler County's Most Notorious Outlaws” will be presented by Bill May at 6:30 p.m. today at the Carousel Shelter at Alameda Park. Admission is free to the 60-minute program sponsored by Butler County Parks and Recreation. Call 724-284-5383.

The Old Stone House has public tours between 10 a.m. and 5 p.m. Saturdays and noon and 5 p.m. Sundays. Admission is $3 per person or $5 per family. An open hearth cooking and bake oven combined class is planned for Saturday. The house at the intersection of Routes 8, 173 and 528 is owned and operated by Slippery Rock University. Call 724-738-2409.

Harmony Museum, 218 Mercer St., Harmony, has guided tours from 1 to 4 p.m. daily except when the museum is closed Mondays. Admission is $7 for adults, $6 for senior citizens, and $3 for youths ages 6 to 17.

ToonSeum, 945 Liberty Ave., and Pittsburgh Filmmakers are presenting a screening of the 2013 documentary, “Dear Mr. Watterson,” about Calvin & Hobbes creator Bill Watterson, at 2 p.m. Saturday at the Harris Theater. Admission is $10. Visit toonseum.org.Children’s Museum, 10 Children’s Way, Allegheny Square, hosts a celebration of the often overlooked condiment, the pickle, and some of its fermented friends from 11 a.m. to 3 p.m. Saturday. “XOXO: An Exhibit About Love and Forgiveness” continues through Aug. 31. Admission is $14 for adults and $13 for children ages 2 to 18 and senior citizens. The museum is open 10 a.m. to 5 p.m. daily. Visit www.pittsburghkids.org.Carnegie Science Center, North Side, presents the exhibit “Blue!” through Jan. 1. In conjunction, blues and bluegrass performances will be held at 1 p.m. Saturdays through Aug. 30. Performances are free with general admission of $17.95 for adults and $11.95 for children ages 3 to 12. Visit CarnegieScienceCenter.org.Fort Pitt Museum in Point State Park each Saturday through Aug. 30 will host Summer Saturdays at the Fort, which is included in the regular admission of $6 for adults, $5 for senior citizens, and $3 for children ages 6 to 17. Visit www.heinzhistorycenter.org.Phipps Conservatory and Botanical Gardens hosts its 10th annual Red, Ripe and Roasted tomato and garlic festival from 11 a.m. to 4 p.m. Aug. 24. The summer flower show continues through 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 age 2 to 18. Visit phipps.conservatory.org.Heinz History Center, 1212 Smallman St., presents “Pittsburgh’s Lost Steamboat: Treasures of the Arabia” through Jan. 4. Center admission is $15 for adults, $13 for senior citizens, and $6 children ages 6 to 17. Visit www.heinzhistorycenter.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 children ages 3 to 18. Admission after 4 p.m. Thursdays is discounted. Visit www.carnegiemnh.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 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.org.