Mandelson is working with Buckingham Palace and the Devolved Administrations to conceive the events, which will enable communities all over the country to mark the Diamond Jubilee.
Although it is still in the early stages, Mandelson has confirmed the celebrations will take place around the first week of June 2012.
In honour of the Queen, a special Diamond Jubilee weekend will also be created - moving the late May Bank Holiday to Monday 4 June and adding an extra Bank Holiday on Tuesday 5 June.
"2012 will be a landmark year for Her Majesty, Britain and the Commonwealth," said Mandelson in a statement to the House of Lords.
"It will also be an opportunity for us as a country to reflect on the incredible changes that have taken place, both here and around the world, over the last six decades."
Queen Victoria is the only British Monarch to have celebrated a Diamond Jubilee previously.
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