COUNTYThe fourth annual Butler Chain Saw Carving Invitational will be 10 a.m. to 8 p.m. Friday and Saturday and 10 a.m. to 5 p.m. Sundayat the Butler Farm Show Grounds, 625 Evans City Road.All three days will be held rain or shine, and admission is $5. Visit butlerchainsawcarving.com.Bartramian Audubon Society is offering birding field trips in Northwestern Pennsylvania including May 14 for the Spring Migration Bird Count and June 12 for the annual BAS Picnic at Goddard State Park. Call 724-794-2434 to register or for more information. These field trips are free, but participation is limited.Succop Nature Park, formerly the Succop Conservancy, 185 W. Airport Road, Penn Township, hosts free birding and nature hikes with a naturalist at 9 a.m. Thursdays. Trails open from dawn to dusk, with dog-friendly walking trails, two ponds and spaces for outdoor activities and education. Call 412-963-6100 or visit www.aswp.org.Jennings Environmental Education Center, Route 528, Brady Township, will host “Homeschool CSI: PA Mammal Atlas” on May 25; Environment through Conservation four-day science experience June 20 to 23 for 10th- through 12th-graders; and DiscoverE: Summer Programs for Kids! for children ages 4 to 12. Registration is necessary. Call 724-794-6011.Moraine State Park, Muddy Creek Township, will be the site of a Wildflower Hike from 10 a.m. to 1 p.m. May 21 from the Route 528 Trailhead, Prospect exit. Also in May 21 from 11 a.m. to 5 p.m. will be the Muddy Creek Oil Field living history exhibit off the Prospect exit. A Family Fishing program is planned for 9:30 a.m. to noon May 28 at Watts Bay Marina on the North Shore (reservations required).

REGIONStar Parties sponsored by the Amateur Astronomers Association of Pittsburgh is scheduled to begin, weather permitting, at about 8:30 p.m. Friday and Saturday at the Nicholas E. Wagman Observatory in Deer Lakes Regional Park near the village of Russellton, Frazer Township, Allegheny County. Call 724-224-2510.McConnells Mill State Park in Slippery Rock Township, just over the county line into Lawrence County off Route 422, will be the site a Volunteer Work Day — Grist Mill Cleanup from 9 a.m. to noon Saturday; to register call the park office at 724 368-8811.