what are the commonwealth games
International sporting event held every 4 years, whereby all 53 nations of the Commonwealth may compete (although there are 71 total teams as some dependant territories compete under their own flag, such as England, Scotland, Wales and Northern Ireland all competing seperately rather than as the UK).
Basically it's about the 3rd biggest sporting event in the world, after the Olympics (winter and summer) and FIFA World Cup.
The Commonwealth makes up about 1/3rd the population of the globe, and they all join in.
http://en.wikipedia.org/wiki/Commonwealth_Games