Jennings Environmental Education Center, Brady Township, is hosting a kayaking trip down Slippery Rock Creek starting at 9 a.m. Oct. 9. Cost is $10. Space is limited. Registration begins Tuesday. Call 724-794-6011.

<B>McConnells Mill State Park</B> in Slippery Rock Township, Lawrence County, has the 18th annual Heritage Festival from 10 a.m. to 6 p.m. Saturday and 11 a.m. to 6 p.m. Sunday. Bluegrass music, free tours of the mill and a Civil War encampment are planned. Admission is free. Call 724-368-9320.<B>Hay Days</B> takes place from 11 a.m. to 4 p.m. Saturday at Hartwood Acres in Hampton Township, Allegheny County. The free event will feature hay rides, face painting and music. Admission is free. Call 412-767-9200.