An artificial or real shamrock leaf is usually worn on St Patrick’s Day. It is the anniversary of his death though it is not certain in what year he died. People also celebrate this day by wearing something green and getting together to party and sing Irish songs. They are usually a very happy crowd. In many pubs they serve green beer and in most restaurants they offer an Irish menu on that day. People wish each other “A happy St. Patrick’s day” and the Irish wear buttons that read “Kiss me I’m Irish”. In most big cities colourful parades with marching bands mark the holiday to the delight of many onlookers and passers-by. It is estimated that there are about 17 million Irish living in the United States.