Saint Patrick's Day (March 17) is a Catholic feast day which celebrates Saint Patrick (386-493), the patron saint of Ireland. It is a national holiday in the Republic of Ireland (but not Northern Ireland); the overseas territory of Montserrat; and the Canadian province of Newfoundland and Labrador.

Saint Patrick's Day is celebrated worldwide by Irish people and increasingly by many of non-Irish descent. Like Christmas and Halloween (which originated as the eve of All Saint's Day) it is increasingly celebrated in a non-religious manner, the celebration themed around all things green and Irish; both Christians and non-Christians celebrate the secular version of the holiday by wearing green, imbibing Irish food and drink, and/or attending parades.

(c) wikipedia

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