St. Patrick's Day Parade and Festival March 17, 2013

The Mayor of London presents the St. Patrick's Day Parade and Festival, a free day of family fun in London.
The day kicks off with a spectacular parade of colourful marching bands, floats, costumed characters and street theatre groups.
The parade leaves Piccadilly at noon and follows a route along; lower Regents Street, Pall Mall and finishes in Trafalgar Square.

Official Website: http://london.gov.uk/events/st-patricks-day-parade-and-festival