Warren County Historical Society, 210 Fourth Ave., 8:30 a.m. to 4:30 p.m.
Warren Public Library, Market St., Warren, open, 10 a.m.-5 p.m.
Community lunch, free to the public, The Salvation Army, 311 Beech St., noon.
Warren County School District, professional development day for teachers, no school for students.
West of the Mark (country), Music in the Park, Soldiers & Sailors Park, Hickory St. at Pennsylvania Ave. W., Warren, sponsored by Northwest Savings Bank, 8-10 p.m., weather permitting.
At Chapman State Park: "The Incredible Journey" of the water molecule, beach concession stand, 6 p.m.; sunset and moonlight paddle, mooring area (registration required, 723-0250 by Aug. 23), 8:30 p.m. (723-0250, ChapmanEE@pa.gov).
Youngsville High School Class of 1958, lunch, Youngsville American Legion, 1 p.m.
"Parenting During Recovery" class, Forest-Warren Human Services, Hospital Dr., North Warren, 9:30 a.m.-noon.
Annual Old-Timers Picnci, Pittsfield Community Center, noon.
At Chapman State Park: "Sticks & Things," on the world of bugs, meet beach concession stand, 4 p.m. Saturday (723-0250, ChapmanEE@pa.gov).
Chandlers Valley Outdoor Festival at the ball field.
Walk and Talk by Master Gardeners, demonstration garden, Betts Park, 10-11 a.m.
"Active Parenting of Teens" class, Forest-Warren Human Services, Hospital Dr., North Warren, 9 a.m.-2 p.m. (726-2100).
ABATE, Alliance of Bikers Aimed Toward Education, Dan's Down Under, Youngsville, 1:30 p.m.
Slovenian Polka Boosters, St. Marys Moose Club, 2-6 p.m.