The Olympic Park is facing its biggest test yet of whether its ready to welcome millions of spectators this summer.
Six major sporting events will take place at Olympic venues over the next week, in the final phase of testing ahead of the Games.
The Olympic Stadium will host the BUCS Visa Outdoor Athletics Championships and the Visa London Disability Athletics Grand Prix; the Visa Water Polo International will take place at the Water Polo Arena; the Riverside Arena will hold the Visa International Invitational Hockey Tournament; Eton Manor will have the Wheelchair Tennis International and the Basketball Arena will be the location for the London Boccia Invitational 2012.
Around 3,000 athletes are taking part and 140,000 spectators are expected.
London 2012 chairman Lord Coe said: "Testing the Olympic Park and its operations is a hugely important part of our plans.
"Over the last 10 months, over 250,000 spectators have watched world-class sport as part of the London Prepares series test event programme, and, in doing so, every one of them is helping us deliver the best possible Games this summer."