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.
Wild Geometry Photographs of wildflowers by James Shirey, juxtaposed by Pete McCutchen’s Geometrics photo series of Las Vegas architecture, Crary Art Gallery, 511 Market St., Warren, 11 a.m.-8 p.m. (www.crarygallery.org)
Rummage Sale, Berea Lutheran Church, Rt. 6 at Rt. 958, 9 a.m.-? ($1 per bag Saturday).
Warren Players presents “Harvey,” Library Theatre.
Gus Macker 3-on-3 Basketball Tournament and Allegheny Burger Festival, sponsored by Warren County Chamber of Business & Industry and Council on Tourism, www.wccbi.org.
Warren High School Class of 1947, lunch, Cable Hollow Restaurant, 11:30 a.m.
First Annual Science Fair and Open House, Learning Enrichment Center, Warren State Hospital grounds, 6-7:30 p.m.
“Parenting During Recovery” class, Forest-Warren Human Services, Hospital Dr., North Warren, 9:30 a.m.-noon (726-2100).