Outdoor Discovery programs, hosted by the Butler County Parks and Recreation Department, will present an ATA martial arts program at 7 p.m. today in the Masonic Shelter at Alameda Park. The final program on Aug. 12 will feature "Barn Owls" in the Carousel Shelter. Admission is free. Call 724-284-5383; visit www.co.butler.pa.us.

Todd Nature Reserve in Sarver hosts a Nature Fest from 8 a.m. to 10 p.m. Saturday. "An Evening with Invasives at Todd Nature Reserve, Part II" is set for 6 to 8 p.m. Wednesday. Call 412-963-6100.

Jennings Environmental Education Center, Route 528 near the intersection of Routes 8 and 173, is open from 8 a.m. to 4 p.m. weekdays and on weekends as scheduled. The trails are open daily from sunrise to sunset for hiking. Call 724-794-6011.

REGIONVenture Outdoors North office in Zelienople will host "Fly Fishing for Bass and Pan Fish" from 9 a.m. to 5 p.m. Saturday at McConnells Mill State Park. Visit www.ventureoutdoors.org.