Commonwealth Games

This is an international, multi-sport even that is held every four years. The games includ thousands of elite nations (http://en.wikipedia.org/wiki/List_of_members_of_the_Commonwealth_of_Nations).
In the games they play sports similar to the ones used in the Olympics as well as lawn bowls (Bowls is a sport in which the objective is to roll slightly asymmetric balls, called bowls, so that they stop close to a smaller—normally white—bowl called the "jack" or "kitty". Bowls, either flat- or crown-green, is usually played outdoors, on grass and synthetic surfaces. Flat-green bows can also be played indoors on synthetic surfaces.), rugby sevens (http://en.wikipedia.org/wiki/Rugby_sevens) and netball (Netball is a ball sport played between two teams of seven players. The sport shares many similarities with basketball, having been derived from early versions of women's basketball.).

The Commonwealth Games Federation (CGF), which also controls the sporting programme and selects the host cities. The first even was held in 1930. There are currently 54 members of the Commonwealth of Nations, and 71 teams participate in the Games.

This information was found on good ol' wiki :)

Here is a video of what the Commonwealth Games are about:
It is the opening ceremony in Delhi http://www.youtube.com/watch?v=MkSWE9UZjdE&feature=related