It is the biggest sporting event.
It would be the Indianapolis 500, over 300,000 spectators in attendance for the event. Super Bowl
The Kentucky Derby
the european champions league
soccer the fifa world cup
The London 2012 Paralympics
According to wikipedia, the sporting event with the largest TV audience worldwide is the FIFA World Cup, followed by the Summer Olympics. The Super Bowl is the biggest TV event period in the United States.
Olympics, College, High School Athletics!