Union Ave Books and Friends of the Knox County Public Library will hold "An Evening with Erik Larson," the author of The Demon of Unrest, a gripping account of the chaotic months between Lincoln’s election and the Confederacy’s shelling of Fort Sumter. Doors open at 6 p.m. The ticket price includes a hardcover copy of the book and entrance to the event. Larson is the author of six national bestsellers: The Splendid and the Vile, Dead Wake, In the Garden of…