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Saint Patrick's Day, or the Feast of Saint Patrick, is a cultural and religious celebration held on 17 March, the traditional death date of Saint Patric k (c. 385 – c. 461), the foremost patron saint of Ireland.

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Saint Patrick's Day was often a bigger celebration among the diaspora than it was in Ireland.

Celebrations generally involve public parades and festivals, Irish traditional music sessions (céilithe), and the wearing of green attire or shamrocks. There are also formal gatherings such as banquets and dances, although these were more common in the past.

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On Saint Patrick's Day, it is customary to wear shamrocks, green clothing or green accessories. Saint Patrick is said to have used the shamrock, a three-leaved plant, to explain the Holy Trinity to the pagan Irish.
This story first appears in writing in 1726, though it may be older.

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Although, if there is a place outside of Ireland where St. Patrick's Day is celebrated in a big way, that is the United States, because already in the 18th century this celebration was commemorated by Irish immigrants. Not surprisingly, it is said that more than ten percent of the country's population has Irish roots.