By adding risers and ganged, movable "X-frame" folding chairs, the stadium's seating capacity may be increased by 8,800 for "mega-events" such as college bowls, NFL Super Bowls, the NFC Championship Game, and the Final Four. The maximum number of tickets sold at State Farm Stadium is 65,000. The current record for attendance at a football game at State Farm Stadium is 63,099 on November 17, 2010, when the Chicago Bears played against the Seattle Seahawks. The record was set just three days after the original record holder, Indianapolis Colts quarterback Peyton Manning, announced he was retiring from professional football. State Farm Stadium has also held two World's Largest Sports Events. On July 10-11, 2011, it hosted the NBA All-Star Game, which had an estimated global audience of more than one billion people. The second event was the NCAA Men's Basketball Tournament Championship Game on April 4, 2012. This game had an estimated global audience of over 3 billion people. In addition to sports events, State Farm Stadium has been used for other large concerts as well. On May 2, 2009, it hosted Ozzy Osbourne's farewell tour. The show drew 77,000 fans and was considered a success despite heavy rain delays that lasted more than three hours.