Saint Patrick’s feast day, as a kind of national day, was already being celebrated by the Irish in Europe in the ninth and tenth centuries. In later times he become more and more widely known as the patron of Ireland.

Saint Patrick’s feast day was finally placed on the universal liturgical calendar in the Catholic Church due to the influence of Waterford-born Franciscan scholar Luke Wadding in the early 1600s. Saint Patrick’s Day thus became a holy day of obligation for Roman Catholics in Ireland.

In 1903, Saint Patrick’s Day became an official public holiday in Ireland. This was thanks to the Bank Holiday (Ireland) Act 1903, an act of the United Kingdom Parliament introduced by Irish MP James O’Mara. O’Mara later introduced the law that required that pubs and bars be closed on 17 March after drinking got out of hand, a provision that was repealed in the 1970s. The first Saint Patrick’s Day parade held in the Irish Free State was held in Dublin in 1931 and was reviewed by the then Minister of Defense Desmond Fitzgerald. Although secular celebrations now exist, the holiday remains a religious observance in Ireland, for both the Roman Catholic Church and the Church of Ireland.

In the mid-1990s the Irish government began a campaign to use Saint Patrick’s Day to showcase Ireland and its culture. The government set up a group called St. Patrick’s Festival, with the aim to:

— Offer a national festival that ranks amongst all of the greatest celebrations in the world and promote excitement throughout Ireland via innovation, creativity, grassroots involvement, and marketing activity.
— Provide the opportunity and motivation for people of Irish descent, (and those who sometimes wish they were Irish) to attend and join in the imaginative and expressive celebrations.
— Project, internationally, an accurate image of Ireland as a creative, professional and sophisticated country with wide appeal, as we approach the new millennium.[14]

The first Saint Patrick’s Festival was held on 17 March 1996. In 1997, it became a three-day event, and by 2000 it was a four-day event. By 2006, the festival was five days long; more than 675,000 people attended the 2009 parade. Overall 2009’s five day festival saw close to 1 million visitors, who took part in festivities that included concerts, outdoor theatre performances, and fireworks.

In every year since 1991, March has been proclaimed Irish-American Heritage Month by the US Congress or President due to the date of St. Patrick’s Day. Today, Saint Patrick’s Day is widely celebrated in America by Irish and non-Irish alike. It is one of the leading days for consumption of alcohol in the United States, and is typically one of the busiest days of the year for bars and restaurants. Many people, regardless of ethnic background, wear green clothing and items. Traditionally, those who are caught not wearing green are pinched affectionately.

Source: Wikipedia