In Ireland on March 17, St. Patrick’s Day has become an elaborate national holiday that allows people to attend church, celebrate Irish heritage, and join in meals honoring the saint. Although the holiday began in Ireland, Americans joined in, though it is unclear whether it involved the Charitable Irish Society in Boston in 1737 or the Manhattan parade hosted by the influx of Irish immigrants there. Regardless, many people around the world have now joined in this colorful St….