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.
Wilder Museum, Irvine, open, 1-5 p.m.
Pennsylvania Watercolor Society 34th Annual International Juried Exhibition, Crary Art Gallery, 511 Market St., Warren, 11 a.m.-8 p.m.
Warren Players presents: “Chemical Imbalance: A Jekyll & Hyde Play,” Library Theatre, 8 p.m. (723-7231)
Haunted House & Trolley Tours, Warren County Historical Society, 210 Fourth Ave., Warren, 6-8:30 p.m. (trolley tickets are limited; warrenhistory.org or 723-1795).
Johnny Appleseed Festival, Sheffield (www.johnnyappleseedfest.net)
Ladies Aid of Wiltsie Community Church selling baked goods, scrubbies, towels, rag rugs, Rada knives, jewelry and hand crafted items, Warren Mall (in the concourse by K-Mart), 9 a.m. to 8:30 p.m.