St. Patrick’s day commemorates Saint Patrick and the arrival of Christianity in Ireland. The day also celebrates the heritage and culture of the Irish in general.
If you happen to be in New York City today (March 17th, 2018), the St. Patrick’s Day Parade can be viewed along 5th Avenue between 44th Street and 79th Street from 11:00 a.m. to 5:00 p.m. Have fun and be safe!

Above is a map of the NYC St. Patrick's Day Parade