Canoe slalom gold medallists Etienne Stott and Tim Baillie are making an appearance at the Lee Valley White Water Centre.
The centre is the first London 2012 venue to open to the public after the Games.
Plans have been unveiled for a £4.5 million development of the centre starting in January 2013.
More top news
Mayor of Newham Sir Robin Wales criticised the International Olympic Committee on the fourth anniversary of the opening ceremony.
If you're missing the euphoria of London 2012 here's your chance to own a real piece of Olympic history.
Her owners were convinced she was gone for good and were shocked when a Parisian cat rescue centre got in touch.