Saint Patrick's Day is a national holiday in Ireland and is celebrated around the world with parades and celebrations. Saint Patrick is famous for bringing Christianity to Ireland and allegedly driving away snakes. Scholars suspect these are metaphorical snakes, as the climate in Ireland is too cold for snakes.

One of the largest Saint Patrick's Day parades is held in New York City, with a crowd of over one million people each year. The first Saint Patrick's Day parade happened in Boston in 1737. In Chicago, the city celebrates by dumping green dye into the Chicago river. It is a tradition that has been around since 1962, and it takes over 40 tons of dye for the river to reach the shade of green.

Saint Patrick was an Englishman whose given name was actually Maewyn Succat. He changed his name after becoming a priest. The shamrocks associated with the day were actually a part of Saint Patrick's ministry. He used them to explain the holy trinity. While Saint Patrick's Day used to be a dry holiday, it is now a holiday commonly associated with drinking alcoholic beverages. The traditional color associated with Saint Patrick was actually Saint Patrick's blue, a very light blue. The color green didn't become popular until the 18th century, when Saint Patrick's Day became linked with the Irish revolution.