David Cauley, 6, of Delaware waits patiently as Darth Vader adds his autograph to Cauley's book during a Star Wars Day at the Powell Branch of the Delaware County District Library, 460 S. Liberty St., on Saturday, March 5, 2011. Cauley's mother said Vader is one of his favorite people. Vader is also known as Bill Kirsop. Members of both the 501st Legion and Rebel Legion attended the event in costume for the hundreds of kids and adults who came to enjoy the activities. See more photos from the event.