Saint Patrick's Day colloquially St. Paddy's Day or simply Paddy's Day, is an annual feast day which celebrates Saint Patrick one of the patron saints of Ireland, and is generally celebrated on March 17. The day is the national holiday of Ireland. It is a bank holiday in Northern Ireland and a public holiday in the Republic of Ireland and Montserrat. In Canada, Great Britain, Australia, the United States, and New Zealand, it is widely celebrated but is not an official holiday.
The world's first St. Patrick's Day parade was held in Boston in 1761, organized by the Charitable Society. The first recorded parade was New York City's celebration which began on 18 March 1762. The New York parade is the largest, typically drawing two million spectators and 150,000 marchers.
St. Patrick's Blue, not green, was the colour long-associated with St. Patrick. Green, the colour most widely associated with Ireland, with Irish people, and with St. Patrick's Day in modern times.
st patrick s day parade new york 2009.

New York City ranks behind Boston, Philadelphia, Tampa, Cleveland, Baltimore, Chicago and other cities in the proportion of residents who list Irish as their primary ancestral group, but the St. Patrick’s Day parade is nonetheless a political rite of passage for politicians and notables.

Even as the parade began at Fifth Avenue and 44th Street at 11 a.m., a group of lesbian and gay Irish organizations demonstrated 13 blocks away, at 57th Street, criticizing the organizers for their policy barring gay groups (though not individuals) from marching. reports NyTimes st patrick s day parade new york city.
watch ST.PATRICKS DAY PARADE WOODSIDE 2009 from youtube video's

The annual Irish Saint Patrick's Day Parade in Sydney, Australia from youtube video