No one knows the exact number. It would be ridiculously hard to figure that out. anywhere from 100 thousands to millions.
There is no specific collective noun for sports, however, any appropriate noun that suits the situation will do. Some examples are a field of sports, an arena of sports, a venue of sports, etc.
sports! 1+9=2
it can hold 3,000 spectators
2000 to 3000 spectators
Millions of spectators watch the NFL Super Bowl.
If you mean the Colosseum in Rome, it could hold 70,000 spectators.
The Arthur Ashe Stadium has a seating capacity of 22,547.
David Veerman has written: 'Sports trivia devotional' -- subject(s): Devotional calendars, Sports spectators, Prayers and devotions, Miscellanea, Juvenile literature, Sports
The US Supreme Court seats nine justices. The courtroom can accommodate approximately 300 spectators, total.
99354
367 are played total in the Us
Just a guess, but it's probably soccer/football, as it is very popular worldwide, so it has many, many spectators!