From Wikipedia: Saint Patrick's Day was made an official Christian feast day in the early 17th century and is observed by the Catholic Church, the Anglican Communion (especially the Church of Ireland), the Eastern Orthodox Church, and the Lutheran Church. The day commemorates Saint Patrick and the arrival of Christianity in Ireland, and celebrates the heritage and culture of the Irish in general. Celebrations generally involve public parades and festivals, cèilidhs, and the wearing of green attire or shamrocks. Christians also attend church services and historically the Lenten restrictions on eating and drinking alcohol were lifted for the day, which encouraged and propagated the holiday's tradition of alcohol consumption.
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