It's that time of year again when more than a million green-clad revelers fill the streets of America’s most Irish big city for the South Boston St. Patrick’s Day parade, celebrating the heritage and contributions of all those who hail from the Emerald Isle.

With less than 24 hours until Boston's annual St. Patrick's Day parade, South Boston is getting ready for the festivities.

With St. Patrick’s Day celebrations picking up around the United States, here is what you need to know about this year’s Boston St. Patrick’s Day parade.