Saint Patrick is the patron saint of Ireland and Nigeria. Saint Patrick's day is celebrated all over Ireland and everywhere in the world where Irish people or their descendants live. New York City has one of the biggest parades. It's a very Irish festival and involves a lot of feasting and celebrations, which includes traditional Irish music, drinking beer and eating corned beef and cabbage. Another tradition is one has to wear green clothing or they will be pinched. Green is the colour for saint Patrick's day.