The Old Stone House will have a French and Indian War Weekend 10 a.m. to 5 p.m. Aug. 9 and 10 a.m. to 4 p.m. Aug. 10. Activities will include an encampment, military demonstrations and battle re-enactments. Period craftsmen and traders will set up displays. Admission is $3 per person or $5 per family. The Old Stone House at the intersection of Routes 8, 173 and 528 in Brady Township is owned and operated by Slippery Rock University. Call 724-738-2409.

Harmony Museum, 218 Mercer St., Harmony, hosts its 10th annual Antique Gun Show Aug. 9 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 is at 1 p.m. Admission is $5. Call 724-452-7341 or visit www.harmonymuseum.org.

Carnegie Science Center, North Side, presents “Astronomy Geek Night: Mars Edition” at 7 p.m. Tuesday, to commemorate the second anniversary of the Mars Curiosity rover’s landing. The exhibit “Blue!” continues 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. For more information, 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, students and the military. 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 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.org.ToonSeum, 945 Liberty Ave., hosts “When Universes Collide: The Ultimate Superhero Smackdown” through Sept. 20. Admission is $6 for those over 13 and $3 for children ages 6 to 12. Senior citizens, college students, veterans and active military pay $5. 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.