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London 2012 Olympics begin in less than a year and there's still loads for the organisers to do, including making sure the Olympic venues are up to scratch.

So every sport is having its own test event to make sure everything runs smoothly. As well as giving athletes a chance to try our the Olympic facilities, it also gives sports fans a chance to watch top stars in action.

Several have already taken place, including the triathlon in Hyde Park and cycling on the Mall, which both went to plan.

But at the basketball, the Chilean national anthem was played instead of the Chinese one. And at the rowing venue in Buckinghamshire, they realised the roads weren't wide enough for the TV trucks!

Here's a run down of the other events that are on, where and when...

BMX Supercross World Cup 2011, at the Olympic Park in London

Canoe sprint, by invitation at Eton Dorney Lake

London Archery Classic at Lord's Cricket Ground

International invitational women's handball, at the Olympic Park, London

Invitational boxing at London's ExCel Centre

International Table Tennis Pro Tour grand finals at London's ExCel Centre

International invitational fencing at London's ExCel Centre

International invitational judo at London's ExCel Centre

International invitational taekwondo at London's ExCel Centre

International invitational women's goalball tournament at the Olympic Park

International invitational wrestling at London's ExCel Centre

International invitational weightlifting at London's ExCel Centre

Olympic qualifier for artistic gymnastics, at North Greenwich Arena

Olympic qualifier for trampoline gymnastics, at North Greenwich Arena

Olympic qualifier for rhythmic gymnastics, at North Greenwich Arena

UCI track cycling World Cup Classic, at the Olympic Park velodrome

Diving World Cup at the Olympic Park aquatics centre

British swimming championships (50m) at the Olympic Park aquatics centre

Men's Olympic football qualifier at City of Coventry stadium

International invitational wheelchair rugby at the Olympic Park basketball arena

Olympic Games synchronised swimming qualification tournament at the Olympic Park aquatics centre

Shooting World Cup at the Royal Artillery Barracks

International invitational hockey tournament at the Olympic Park hockey centre

Wheelchair tennis at Eton Manor, Olympic Park

Paralympic Archery International 2012 at the Royal Artillery Barracks

British University and Colleges sports championships for track and field events, at the Olympic Stadium

International invitational boccia at the Olympic Park's basketball arena

Disability Grand Prix (Athletics) at the Olympic Stadium