Friday events:

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 Art League Show, “Turning 60,” Wetmore Gallery, Warren Public Library, regular library hours.

Music in the Park, “Black Diamond,” classic rock, Soldiers & Sailors Park, Pennsylvania Ave. W. at Hickory St., Warren, sponsored by Northwest Savings Bank, 8 p.m.

Allegheny 100 Challenge, south of Marienville at Rt. 666 Trailhead, Vowinckel, hikers arrive, 5 p.m.; kick-off, 5:30 p.m.; hikers released, 6 p.m.

Retired women of GTE Sylvania (Osram), lunch, New Beginnings, Sugar Grove, 1 p.m.