On or around March 17 we celebrate St Patrick's Day. The reason the date is not fixed is that it depends on the Holy Week. If March 17 falls during Holy Week, the celebration is moved to another date.
History of Saint Patrick’s Day
St Patrick is one of the patron saints of Ireland. Most of our information about Saint Patrick comes from the Declaration, which is supposed to be written by Patrick Himself.
He was born in Roman Britain, in the fourth century. He was kidnapped by Irish raiders when he was a young adult and taken as a slave to Gaelic Ireland. During the time he was there, he "found God". According to the Declaration, God told Patrick to flee to the coast, where a ship would be waiting to take him home.
Being home, Patrick went on to become a priest just like his father and grandfather.
Tradition says that Patrick returned to Ireland as a missionary, to convert the pagan Irish to Christianity. There was made an allegory as well, in which he drove "snakes" out of Ireland. The "snakes" the allegory refers to are the druids or pagan worshipers of snake or serpent gods.
He died on 17 March and is buried under Down Cathedral in Downpatrick, Ireland.
How to celebrate Saint Patrick’s Day
The easy way is to wear something green on the day. There are a lot of parties featuring Irish food and drinks where you could go. You can also attend a parade or festival. You can also plan a pilgrimage to St Patrick's Purgatory.