Saint Patrick's Day was made an official Christian feast day in the early 17th century.
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, céilís, and the wearing of green attire or shamrocks.
Christians who belong to liturgical denominations also attend church services and historically the Lentern restrictions on eating and drinking alcohol were lifted for the day, which has encouraged and propagated the holiday's tradition of alcohol consumption.

Saint Patrick's Day is a public holiday and it is also widely celebrated in the UK,Canada, USA, Australia, New Zealand, Brazil & argentina. Saint Patrick's Day is celebrated in more countries than any other national festival.

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Examples of non-religious Easter traditions include Easter eggs, and related games such as egg rolling and egg decorating.

It’s believed that eggs represented fertility and birth in certain pagan traditions that pre-date Christianity. Egg decorating may have become part of the Easter celebration in a nod to the religious significance of Easter, i.e., Jesus’ resurrection or re-birth.

Many people—mostly children—also participate in Easter egg “hunts,” in which decorated eggs are hidden. Perhaps the most famous Easter tradition for children is the annual White House Easter Egg Roll, when children roll Easter eggs down Capitol Hill.

In some households, a character known as the Easter Bunny delivers candy and chocolate eggs to children on Easter Sunday morning. These candies often arrive in an Easter basket.

The exact origins of the Easter Bunny tradition are unknown, although some historians believe it arrived in America with German immigrants in the 1700s. Rabbits are, in many cultures, known as enthusiastic procreators, so the arrival of baby bunnies in springtime meadows became associated with birth and renewal.

Easter foods are steeped in symbolism. An Easter dinner of lamb also has historical roots, since a lamb was often used as a sacrificial animal in Jewish traditions, and lamb is frequently served during Passover. The phrase “lamb of God” is sometimes used to refer to Jesus and the sacrificial nature of his death.

Today, Easter is a commercial event as well as a religious holiday, marked by high sales for greeting cards, candies (such as Peeps, chocolate eggs and chocolate Easter bunnies) and other gifts.