There are many different races that are held besides foot races. These races include bike races, swimming races, and competence races.
The Susan G. Komen Race for the Cure is held in many cities in the United States, as well as in the Bahamas, Belgium, Bosnia and Herzegovina, Brazil, Egypt, Georgia, Germany, Greece, Israel, Italy and Tanzania. All in all about 50 countries.
None.
Pigeons races are held in many countries.
Once a year.
Once a year.
Twice a year.
Once a year.
Once a year.
Once a year.
Once a year.
The Coliseum is pretty much proof itself that games and races were held. The are also many ancient documentions that account for chariot races firsthand.