A panel of judges including football freestyler Billy Wingrove, SB.TV presenter Georgia Lewis Anderson and YouTube star Amazing Phil picked the ten acts who will perform at Stratford's Olympic Park on August 31.
BMX rider Keelan was replaced by juggler Lee Tinnion after the highlights video was made.
One overall winner will go to Olympics 2016 host city Rio de Janeiro and have their own promo trail directed by BAFTA-winning actor, filmmaker and somewhereto_ ambassador Adam Deacon.
"I'm a massive believer in giving young people the chance to show off what they can do because there's so much undiscovered talent out there," said Deacon when the project launched.
Funded by Legacy Trust UK, somewhereto_ is part of the Cultural Olympiad and London 2012 Festival.
It is also an independent charity set up to create a lasting cultural and sporting legacy from London 2012 in communities across the UK.