Monday, March 17
(Undated) -- Millions of Irish-Americans and the Irish-at-heart will be celebrating St. Patrick's Day. There are some big parades today, including the nation's oldest in New York City where over one-million spectators are expected to be on hand. St. Patrick's Day was born as a Roman Catholic holiday to recognize St. Patrick, the bishop tasked to bring Christianity to Ireland. The day of celebration was brought to America by Irish immigrants.