Saint Patrick's day is celebrated world wide every year. Wear something or anything green. Eat and drink something green. When I first arrived here in the US, I didn't know anything about St. Patrick's day. I actually got pinch in the ear for not wearing anything green.
St. Patrick uses shamrock to represent the holy trinity (Father, Son, and the Holy Spirit) when he was teaching about the bible. But someone told me if you have 4 clover leaf, it is good luck. And if you drink green beer, you'll get drunk.
Happy St.Patrick's day!
