From Wandsworth to Camden, hundreds of people have set to work in their local communities to mark Make A Difference Day.
Many have been inspired by the example set by London's 70-thousand Olympic Gamesmakers.
Piers Hopkirk has the story.
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The family of murdered teenager Jimmy Mizen have held a community event in his memory to raise money for the foundation in his name.
A drawing made for one of the famous paintings from the Victorian era - Flaming June - has been rediscovered after more than 100 years.