In several communities in Australia where there are many homes fronting onto quiet bays or canals, a custom has evolved of a large boat or ferry cruising slowly around the area, usually on Christmas Eve, either playing Christmas carols through its public address system or they have a live choir on board that sings the carols accompanied by musicians. The main boat is accompanied by a fleet of private power cruisers with their own lighting display and singers.
As it is usually a calm night the reflections of many Christmas lighting decorations add to the atmosphere.
This photo was taken in about 2003.
Move on to the late evening of 20 December 2013 and this the carol boat fleet for that year.