The rapper was performing at the Peace Mix concert at the capital's Roundhouse when excited fans stormed the stage and sneaked into his dressing room.
The star performed his popular hits 'Number One' and 'You're Not Alone', as well as giving the crowd a live preview of his new single 'Help Me'.
"When Peace Mix approached me I knew that it was something that I could get involved in because I've known so many people that have used music to rise above bad situations," Stryder said.
Peace Mix was created by the Big Lottery Fund and the New Day Foundation as a response to last year's London riots and encourage young people across the UK to be part of a campaign that promotes peace.
Maximo Park also performed at the packed-out event along with a handful of regional Peace Mix Mic Relay winners.
Watch the music video for Tinchy Stryder's 'Help Me' below: