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Enjoy the rare spectacle of a traffic-free street in Zone One on four Sundays throughout summer (July 14, July 21, August 18 and September 15), as Regent Street's classy curve is pedestrianised from Oxford Circus all the way to Piccadilly Circus for a street party. The festivities will take on a different theme each week, with free entry, installations, demonstrations, food and drink and activities to get stuck into.