Scott Sommerdorf | The Salt Lake Tribune Rare book dealer Tony Weller helps collector Kellie Wood with an assessment of her rare book during a rare book appraisal session at the 16th annual Book Festival, sponsored by the Utah Humanities Council. The event is a two-day outdoor festival taking place on Library Square Saturday and Sunday that includes authors, music, book arts, a poetry slam, writing activities and more, Saturday, September 28, 2013.