Video: SantaCon 2012: thousands invade London hot spots to mark Christmas Thousands of revellers dressed as Father Christmas descended on London for this year's event - which spanned 27 countries and 275 towns and cities. The festive walkabout - part flashmob, part pub crawl - saw central London awash with red and white figures, with amateur footage showing the Tate Modern gallery and Trafalgar Square inundated.