While great artists like Jay-Z, Eminem, The Black Eyed Peas and Muse play over six stages, organisers will be keeping a lookout for the most imaginative costume on Fancy Dress Friday (July 9th 2010).
Photographers will wander around taking pictures of people dressed up before picking the ten best outfits.
These will then be put on the Oxegen website so that the public can vote for the final winner, who will win free VIP tickets for next year, Hot Press Festival News reports.
If you want to stand out from the crowds, it's best to avoid outfits that lots of other people may choose in favour of something laugh-out-loud funny.
How about a runaway hospital patient costume - complete with a pretend bare behind - for guaranteed giggles?
Or you could opt for a pink gorilla costume and turn up in the background of as many photos as you can for maximum exposure!