There are 6 sports being staged out side of London, as you can see form the related link below.
How can normal people get involved in the olympic games
There are 302 events in 26 sports for the 2012 London Olympics
There are a few venues that, by necessity, are outside the boundaries of Greater London, such as the Weymouth and Portland National Sailing Academy some 125 miles (200 km) southwest of London, which hosted the sailing events. The football tournament was staged at several grounds around the UK.
there will be 106 games in the Olympics
There were 41.
A sport with 10 events
Some events can't be held in London. Sailing for example.