Saint Patrick’s Day is a cultural and religious holiday celebrated annually on March 17th. It commemorates Saint Patrick (c. AD 387–461), the most commonly recognised of the patron saints of Ireland, and the arrival of Christianity in Ireland. It is observed by the Catholic Church, the Anglican Communion (especially the Church of Ireland), the Eastern Orthodox Church and Lutheran Church. Saint Patrick’s Day was made an official feast day in the early seventeenth century, and has gradually become a secular celebration of Irish culture in general.
Saint Patrick’s Day is a public holiday in the Republic of Ireland, Northern Ireland, Newfoundland and Labrador and in Montserrat. It is also widely celebrated by the Irish diaspora, especially in places such as Great Britain, Canada, the United States, Argentina, Australia, and New Zealand, among others. Today, St. Patrick’s Day is probably the most widely celebrated saint’s day in the world. [Source: Wikipedia]