why do we celebrate st patrick and wear green
âThe Irish and those who wish they were.â. But for 24 hours this Wednesday, that saying is a pot oâ blarney. This St. Patrickâs Day, weâll all be Irish. St. Patrick's Day was originally a Roman Catholic feast day for Ireland âs patron saint, celebrated only in Ireland since before the 1600s.But it evolved into a secular holiday in the 1700s, when Irish immigrants in the US held some of the first St. Patrickâs Day parades.t. Patrickâs revelers thought wearing green made one invisible to leprechauns, fairy creatures who would pinch anyone they could see (anyone not wearing green). People began pinching those who didnât wear green as a reminder that leprechauns would sneak up and pinch green-abstainers.