A novel of echoes, reflections (sometimes inverted), and criss-crossing lines, Lance Olsen’s Calendar of Regrets locates nodes of intersection, spotlights the forgotten, and magnifies the unnoticed. Calendar of Regrets by Lance Olsen. Fiction Collective, 456 pages, $22. By Vincent Czyz Lance Olsen’s Calendar of Regrets had me from the opening scene: a vividly imagined and…