GRIFFITH/ENGEN: Minnesotans Cary Griffith and James A. Engen sign copies of their latest books. Griffith’s is “Grizzly Narrows,” part of his Sam Rivers mystery series; Engen’s is “The Trestle,” a novel about life on St. Paul’s East Side in the 1960s. 10 a.m.-noon Friday, Lake Country Booksellers, 4766 Washington Square, White Bear Lake.