Ladies Day at Chantilly, Route des Aigles, 60500 Chantilly, France, including the 164th Prix de Diane Longines, the top race for three year old fillies. Set in the grounds of the château de Chantilly, adjoining the sumptuous stables built by the Princes de Condé, the day is regarded as one of the most glamorous events in the French racing calendar. Spectators are encouraged to dress smartly and take a picnic on the lawns around the racecourse. The lady wearing the most elegant hat wins the Longines Prix de l'Elégance Mademoiselle Diane. Sunday 16th June 2013.