Harmony Museum, 218 Mercer St., Harmony, hosts its 10th annual Antique Gun Show on Saturday along with an auction for a percussion rifle attributed to 19th century Harmony gunsmith Charles Flowers. Show hours in Stewart Hall are 9 a.m. to 4 p.m. The auction will be held at 1 p.m. Admission is $5 with proceeds benefiting museum operations. Call 724-452-7341 or visit www.harmonymuseum.org.

The Old Stone House will have a French and Indian War Weekend from 10 a.m. to 5 p.m. Saturday and 10 a.m. to 4 p.m. Sunday. The annual encampment will have military demonstrations and battle re-enactments. Period craftsmen and traders will set up displays showcasing colonial-era living. Admission is $3 per person or $5 per family. The historic site at the intersection of Routes 8, 173 and 528 is owned and operated by Slippery Rock University. Call 724-738-2409.

Carnegie Science Center, North Side, will present Blueprints Weekend Saturday and Sunday. The exhibit “Blue!” continues through Jan. 1. In conjunction, blues and bluegrass performances will be 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. For information or to register, visit CarnegieScienceCenter.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. 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.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.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 for students and children ages 6 to 17. Visit www.heinzhistorycenter.org.National Aviary, 700 Arch St., presents “Taking Flight: An Aerial Adventure” at 11 a.m. and 2 p.m. daily 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. Visit www.aviary.org.ToonSeum, 945 Liberty Ave., hosts “When Universes Collide: The Ultimate Superhero Smackdown” through Sept. 20. 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. Call 412-232-0199 or visit toonseum.org.Children’s Museum, Allegheny Square, hosts “XOXO: An Exhibit About Love and Forgiveness” through Aug. 31. Admission is$14 for adults and $13 for children ages 2 to 18 and senior citizens. Hours are 10 a.m. to 5 p.m. daily. Visit www.pittsburghkids.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 3 to 18. Admission after 4 p.m. Thursdays is discounted. Visit www.carnegiemnh.org.