And in the middle is a holiday associated with merry drinking and a centuries-old religious figure: St. Patrick's Day. Monday, March 17, is the holiday to celebrate everything Irish, including St.

Across the pond, the Irish capital of Dublin culminates its three-day festival with a parade Monday. Cities such as Liverpool, England, another city transformed by Irish immigration, also host celebrations on the St. Patrick’s feast day.

St. Patrick’s Day, the annual celebration of all things Irish, is being marked in cities across the country on Monday with boisterous parades and celebrations. New York City hosts one of the largest and oldest parades in the United States.

Princess Kate participated in a beloved St. Patrick's Day tradition Monday after missing the event last year due to health issues. Kate attended the Irish Guards' annual St. Patrick's Day parade Monday in London, an event she's attended regularly since 2012, making her absence at last year's parade stand out.

Britain's Princess Kate attended a St Patrick's Day parade at Wellington Barracks in London on Monday (March 17).