The biggest of all celebrations in Ireland, St. Patrick's Festival, named after Ireland's patron saint, celebrates the country's rich culture and heritage with parades, dancing, music, food and plenty of pints of beer. What started as a one-day holiday on March 17 is now a multiday celebration enjoyed by more than a million locals each year. Although Dublin's celebration is arguably one of the country's biggest, you're guaranteed to find holiday revelers all across Ireland, from small villages to major metropolitan cities.