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
Oliver Dearlove died 24 hours after receiving the fatal blow outside Morden's wine bar in Blackheath last summer.
She was found in Tadworth in Surrey and is so young the RSPCA can't work out what breed she is.
Unemployed plasterer Trevor Timon had been cleared of Oliver Dearlove's murder but admitted manslaughter.