New York City, or Chicago
Well the first St. Patricks day parade was actually held in New York City in 1762. For the second question one million people took part in the St. Patricks day festival in Dublin. Hope this helps
New York City is the largest. Chicago and Boston are close seconds. The shortest however is held in Conklin, Michigan.
Boston
Patrickstan! But seriously... The first St. Patricks Day Parade in an independent Ireland was held in Dublin in 1931, although it had been an official public holiday since 1903.
New York City
Macy's held the first Thanksgiving day parade in New York City on November 27, 1924.
The first pride parade in the US was held on June 28, 1970, in New York City to commemorate the one-year anniversary of the Stonewall riots.
new York city
The largest St. Patrick's Day parade is held each year in New York City. The parade goes up 5th Avenue, beginning at 44th Street and ending at 79th Street. The first St. Patrick's Day parade was held in New York City in 1762.
The largest St. Patricks day parade is in Savannah Ga. The reason it is unique is because so many people get together and have fun and its so large.
Irland because he had baneshed the snakes away
There is no NYC (Christmas Parade) per se, it should be noted the last Float in the Thanksgiving Day Parade, is traditionaly Saint Nick in his sleigh with reindeer, heralding in the Yuletide season! No Christmas Parade, however.