The Super Bowl
Soccer is the most attended sport in the world but only while the Fifa World Cup is on. Nascar has the largest stadiums but are not always sold out, daytona 500 is the biggest stadium in racing, in soccer a staduim in Brazil is the largest staduim that at maximum can host nearly 250,000 people.
new Yankee stadium
Football has a stadium which can fit 9 football pitches 9 full size
Football is the most watched and most attended sport in America
Petro Sport Stadium was created in 2006.
If it is for the school's sport team, not all have their own field or stadium.
football
It is a Marathon stadium
tour de france, then racing events. Formula 1 & Nascar are the two largest in terms of attendance of any sport, by far. The Indy 500 draws in over 400,000
There is a world cup for every sport. Even if one sport is defined, the event occurs multiple times, in multiple venues. Hence there are hundreds of places which would count, not just a single one, and one sport is still a large subset of these.
the first tv sport event was in 1922 and it was baseball.
tennis