Midnight Revels - New Year's Eve 1949, Albert Hall
Cleaning Ladies' 13th Annual Ball 1960, Walworth Road, London
Aristocrats at a "Gay Nineties" party, London 1933
and on a more contemporary note
The Big Dance Royal Flashmob at Buckingham Palace
Goofy guys doing the Hobo Dance in front of Horse Guards
and in marked contrast, here's Tom Hiddleston dancing.
and Tom Hiddleston dancing again.