A free festival of sport and music will be held in parks across London during the Olympics.
Giant screens will beam the Games to crowds in Hyde Park and Victoria Park with performances from acts including Sir Tom Jones and Feeder.
Sports fans can try out bungee, trampolining, tennis, basketball and cricket.
A 180ft-high observation wheel in Victoria Park will offer views of the Olympic Park.
The series of events, called BT London Live, will run from July to August before moving to Trafalgar Square for the Paralympic Games.
Sir Tom Jones will perform in Hyde Park on Saturday 28 July. Free events in Victoria Park start the previous day.
London Mayor Boris Johnson said: "With our partners, we're presenting an unprecedented number of events in every part of the capital to suit every taste and make this a summer like no other.
"BT London Live is a fantastic way for hundreds of thousands of people to experience live action from the Games for free and for everyone inspired by their Olympic and Paralympic heroes to try out different sports."
Entry is free but there will also be a limited number of guaranteed entry tickets, which carry a booking fee.
Hyde Park will also host two fee-paying concerts for the Olympic opening and closing ceremonies.
Duran Duran have already been announced as headliners for the opening concert on 27 July where they will play alongside Snow Patrol, representing Northern Ireland, Stereophonics for Wales, and Paolo Nutini who will play for Scotland.
Blur headline the closing show on 12 August, along with The Specials and New Order.