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The O2 becomes the 'O-Blue' for the afternoon in celebration of the release of 'The Smurfs in 3D', with games and activities, the focus of which is the Guinness World Records attempt to break the record for the largest ever gathering of people dressed as Smurfs (the current record is 2510). You are encouraged to come dressed as a Smurf – there are prizes for the best costume. For registration and costume guidelines see www.facebook.com/SmurfMovieUK