The convention where Star Wars: X-Wing Miniatures Game was released had how many unique attendees in 2015?
Star Wars: X-Wing Miniatures Game: Star Wars: X-Wing is a miniature war game designed by Jay Little and produced by Fantasy Flight Games that was released at Gen Con in 2012. Gen Con: Gen Con is the largest tabletop-game convention in North America by both attendance and number of events. Gen Con:  In 2015, Gen Con had 61,423 unique attendees, making it one of the largest conventions in North America.
61,423