A free Outdoor Discovery series, hosted by Butler County Parks and Recreation Department, takes place Thursday nights at Alameda Park, off New Castle Road. The programs will begin at 7 p.m. in the Carousel Shelter. Scheduled tonight is Playthings Etc. Going on June 21 will be Turtle Talk with Greg Levish. Call 724-284-5383.

Jennings Environmental Education Center, Route 528, Brady Township, plans summer programs for children. Concurrent sessions are planned at Moraine State Park. Jennings 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. Call 724-794-6011.

Moraine Preservation Fund will conduct summer cruises on its Nautical Nature pontoon boat from 1 to 3 p.m. Saturdays and Sundays through Oct. 28. There also are Wednesday night pizza cruises that begin at 5 p.m. Fees are involved. Call 724-368-9185 or 724-368-8811.

McConnells Mill State Park in Slippery Rock Township, Lawrence County, has the gristmill open from 11 a.m. to 4 p.m. Saturdays and Sundays through October. Tours, lasting about 45 minutes, are available at 1 and 3 p.m. Saturdays and Sundays. Admission and parking are free. Call 724-368-3612.Amateur Astronomers Association of Pittsburgh will celebrate Wagman Observatory’s 25th anniversary with public star parties June 22 and 23. Prizes, including one beginner’s telescope, will be given out each evening. Activities are held, weather permitting, beginning just before dark. The observatory is in Deer Lakes Regional Park in Frazer Township, Allegheny County. Admission is free. Donations are accepted for the costs of operation. Call 724-224-2510 or visit www.3ap.org.