It's a cultural and religious holiday celebrated on March 17th. It commemorates Saint Patrick (c. AD 387–461), the most commonly recognised of the patron saints of Ireland, and the arrival of Christianity in Ireland.
Hell yeah, Pancho! Epic. :D When I went over there, I stopped in Concepción before driving to Chillán. :D Damn man. I miss Chile as hell. I need to plan a trip over there again