Hundreds of spectators will be there to watch professionals perform (including the legendary BMX rider, Matt Hoffman) and to buy the latest retail equipment/street fashions.
BMX and skateboard exhibitions promise gravity-defying performances while the UK leg of the European "King of Dirt" Tour guarantees thrills and spills.
Scores of DJs will be providing a selection of grimy beats. This could be the block party of the summer.
Clapham Common, London SW4 (0171-729 8442) 10pm-8am, pounds 8, today and tomorrow
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