Annual ceremony taking place on the Thames where British Crown swans are rounded up, caught, ringed, and then released. The party occupy a flotilla of row boats the sterns adorned with flags. A large white ensign bearing a gilt crown and the letters 'E.R', with the device of a swan is displayed by the crown boat; while the Dyers' and Vintners' craft have blue and red flags respectively also emblazoned with swans.