Northwest Pennsylvania Steam Engine and Old Equipment Association of Portersville will have its Spring Gas-Up on Saturday and Sunday at the show grounds, Route 19. Activities will include old tractor pulls, steam engines, saw milling, a vintage village, parades of equipment and food. Call 724-752-1845 or 724-840-2561.

Old Stone House, at the intersection of Routes 8, 173 and 528, has teamed with the Center for Paranormal Study and Investigation for sessions on conducting paranormal investigations. The 2011 programs were sellouts. Sessions will be offered from 8:30 to 11:30 p.m. Saturday, June 22, July 21, Aug. 17, Sept. 29 and Oct. 19. Non-refundable tickets are $15 and are offered on a first come, first served basis. Group size is limited to 20. Call 724-738-4964 or visit www.oldstonehousePA.org.

PITTSBURGHPhipps Conservatory and Botanical Gardens at One Schenley Park presents its summer flower show “Fountains of Youth” through Sept. 30. Phipps is open daily from 9:30 a.m. to 5 p.m. and until 10 p.m. Fridays. Admission is $12 for adults; $11 for senior citizens and students with ID; $9 for children ages 2 to 18; and free for children younger than 2. Call 412-622-6914 or visit phipps.conservatory.org.Heinz History Center, 1212 Smallman St., presents “Stars and Stripes: An American Story” through June 17. The center is open daily from 10 a.m. to 5 p.m. Admission is $10 for adults, $9 for senior citizens, $5 for students with ID and for children ages 4 to 17. Call 412-454-6000 or visit www.heinzhistorycenter.org.National Aviary, 700 Arch St., is open daily from 10 a.m. to 5 p.m. Admission is $13 for adults, $12 for senior citizens, $11 for children ages 2 to 18, and free for children younger than 2. Call 412-323-7235 or visit www.aviary.org.Carnegie Science Center, North Side, will honor veterans with a special memorial from 10 to 11 a.m. May 27 on the USS Requin submarine, docked on the Ohio River. The event is free. Visitors are encouraged to watch from the Ohio River shore. The center will be open on Memorial Day. Admission is $17.95 for adults and $11.95 for children ages 3 to 12. Call 412-237-3400.