Labyrinth Books will host a book signing on Saturday, May 6, 11 a.m. to 1 p.m. for “Discovering Princeton: A Photographic Guide with Five Walking Tours” by Jennifer Jang and Wiebke Martens. Executive Director of the Historical Society of Princeton Izzy Kadin says it will become “the essential guide to Princeton.” There will be a talk/slide show co-sponsored by the Princeton Public Library and Labyrinth on June 13 at 6 p.m. followed by a walk on the University campus.