National Rendezvous and Living History Foundation will have its 37th annual Eastern Primitive Rendezvous from 10 a.m. to 5 p.m. Saturday and Sunday at Cooper's Lake Campground, 205 Currie Road, Worth Township. This event is a reenactment of American life from 1640-1840. Admission is $5 for adults and free for those 17 and younger and active service personnel with valid ID. Visit www.easternprimitiverendezvous.com

Bartramian Audubon Society's wildlife sanctuaries are having field trips to explore their natural habitats. A trip to West Park in New Castle is Oct. 5. The events are free and start at 8:30 a.m. Contact Gene Wilhelm at 724-794-2434 or genewilhelm@aol.com.

Jennings Environmental Education Center, Route 528, Brady Township, will be the site of the 20th annual National Public Lands Day from 9 a.m. to 1 p.m. Sept. 28. Register at 724-794-6011 or www.apps.dcnr.state.pa.us/Calendar/list.asp no later than Friday.

McConnells Mill State Park in Slippery Rock Township, Lawrence County, hosts the 21st annual Heritage Festival from 11 a.m. to 6 p.m. Sept. 28 and 29. The mill is open from 11 a.m. to 4 p.m. Fridays, Saturdays and Sundays through October. Tours, which last about 45 minutes, are available at 1 and 3 p.m. Call 724-368-3612.