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Heart's Feel Good Weekend with Zoe Hardman 6am - 10am
11 September 2010, 10:13 | Updated: 11 September 2010, 10:15
It's the Mayor's Thames Festival, London's largest free, open air arts festival.
It takes place on the River Thames, the riverside walkways, and public open spaces from Westminster Bridge to Tower Bridge and beyond.
Adrian Evans is the Director of the Mayor's Thames Festival, and he's told Heart there'll be music stages, dance, street arts, choirs and lots of things for children to do.