Atlantic City’s largest sportsbook hosted its official grand opening celebration on Sunday. The Book at Bally’s, all 15,228 square feet of it, hosted what resembled a Philadelphia Eagles tailgate party. Cotton candy, Cracker Jack, and AC’s first self-serve beer wall, included. But this gathering of several hundred NFL betting fans was not interested in a ribbon-cutting ceremony or speeches. Kickoff for the Eagles-Washington Redskins game was fast approaching. The line for the betting windows extended to the center of the Wild Wild Wild West Casino floor. That’s where the former temporary space was set up. While all the betting action was taking place, there was a small ceremony nearby. Former Eagles’ Chris Long, Hollis Thomas and Fred Barnett came running through a giant banner as confetti was fired off. There was no need for someone famous to step up to one of the betting windows to place $100 bet on the Dallas Cowboys to cover against the New York Giants.