Saint Patrick’s Day was made an official feast day in the early seventeenth century and is observed by the Catholic Church, the Anglican Communion (especially the Church of Ireland), the Eastern Orthodox Church and Lutheran Church. For Christians, the day commemorates Saint Patrick and the arrival of Christianity in Ireland. However, it has gradually become more of a secular celebration of Irishness and Irish culture.
The day generally involves public parades and festivals, céilithe, and wearing of green attire or shamrocks. Christians also attend church services and the Lenten restrictions on eating and drinking alcohol are lifted for the day.
Saint Patrick’s Day is a public holiday in the Republic of Ireland, Northern Ireland, Newfoundland and Labrador and Montserrat. It is also widely celebrated by the Irish diaspora around the world; especially in Britain, Canada, the United States, Argentina, Australia and New Zealand.