Harmony Museum, 218 Mercer St., will host its annual antique show and sale fundraiser Saturday and Sunday at the 1805 Harmony Society-Mennonite Barn annex, 303 Mercer Road. Show hours are 10 a.m. to 5 p.m. Saturday and 11 a.m. to 4 p.m. Sunday. Admission is $5. Lunch and refreshments will be available.

Mars Shortline Railroad has tiny train rides available. Weather permitting, adults and children can catch rides from 10 a.m. to 2 p.m. Fridays and 1 to 4 p.m. Saturdays through September at the Mars History and Landmark Society's restored small scale B&O Train Station south of downtown at 1 Brickyard Road. Rides are free. Call 724-272-9588 or visit marshistory.org.

The Old Stone House has an open hearth cooking class Oct. 10, from 10 a.m. to 2 p.m. Cost is $35, with a two-week advance registration required. Visit http://oldstonehousepa.org/tasteofhistory. The Old Stone House, at the intersection of Routes 8, 528, and 173, is owned and operated by Slippery Rock University.

Drake Well Museum, 202 Museum Lane, Titusville, will host its annual “Fall Gas Up” on Saturday, sponsored by the Pioneer Steam and Gas Engine Society. Displays will include antique engines and farm and oil field equipment. Gas Up hours are 9 a.m. to 3 p.m., and admission is included in the museum's regular fees of $10 for adults, $8 for senior citizens, and $5 for children ages 3 to 11. Call 814-827-2797Oil Creel & Titusville Railroad has train rides Saturdays and Sundays in September. The train leaves the Perry Street Station, 409 S. Perry St., Titusville, at 1 p.m. Call ahead for ticket costs and reservations. Call 814-676-1733.

Carnegie Science Center, North Side, will have a “ROBOTS” celebration from 10 a.m. to 5 p.m. Saturday in honor of a new giant-screen film. A Free Science Day on Sept. 27 will offer free general admission. Visit CarnegieScienceCenter.org. The center will be closed Sunday.ToonSeum, Pittsburgh's Museum of Cartoon Art, 945 Liberty Ave., hosts “Drawn in Pittsburgh” through Oct. 18. Admission is $8 for those over 13 and $4 for children 6 to 12. Senior citizens, college students, veterans and active military pay $7. Visit toonseum.org.Children's Museum, Allegheny Square, concludes the “Very Eric Carle” exhibit Sunday. Hours are 10 a.m. to 5 p.m. daily, with extended hours Sept. 18 until 8 p.m. Admission is $14 for adults and $13 for children ages 2 to 18 and senior citizens. Visit www.pittsburghkids.org.Heinz History Center, 1212 Smallman St., presents the “We Can Do It!” WWII exhibition. Center admission is $15 for adults, $13 for seniors, and $6 for children ages 6 to 17. Admission for active and retired military is $6. Visit www.heinzhistorycenter.org.Phipps Conservatory and Botanical Gardens, 700 Frank Curto Drive, continues the Summer Flower Show 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 students and senior citizens; and $11 for children ages 2 to 18. Call 412-622-6914.