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Thousands of people are set to get an exclusive look at the 2012 opening ceremony.
As a thank you 2,012 pairs of tickets for the dress rehearsal are being given to volunteers who've helped improve their local communities.
It comes as the Mayor says he wants London to be the "epicentre of fun in the universe" during the 2012 Olympics.
He's revealed they'll be concert stages and big screens in 4 live sites including Hyde Park and Victoria Park.