Dia de sanpatricio

Saint Patrick's Day
Saint Patrick's Day (Irish: Lá Fhéile Pádraig) is a religious holiday celebrated internationally on 17 March. It is commemorates Saint Patrick (c. AD 387–461), the most commonlyrecognised of the patron saints of Ireland, and the arrival of Christianity in Ireland. It is observed by the Catholic Church, the Anglican Communion (especially the Church of Ireland),the EasternOrthodox Church and Lutheran Church. Saint Patrick's Day was made an official feast day in the early 17th century, and has gradually become a celebration of Irish culture in general.
The day isgenerally characterised by the attendance of church services, wearing of green attire (especially shamrocks), and the lifting of Lenten restrictions on eating and drinking alcohol, which is often proscribedduring the rest of the season.
Saint Patrick's Day is a public holiday in the Republic of Ireland, Northern Ireland, Newfoundland and Labrador and in Montserrat. It is also widely celebrated by theIrish diaspora, especially in places such as the Great Britain, Canada, the United States, Argentina, Australia, and New Zealand, among others.
Questions
1.- What does green color mean this day?Originally, the colour associated with Saint Patrick was blue. Over the years the colour green and its association with Saint Patrick's day grew. Green ribbons and shamrocks were worn in celebration ofSt Patrick's Day as early as the 17th century. He is said to have used the shamrock, a three-leaved plant, to explain the Holy Trinity to the pagan Irish, and the wearing and display of shamrocks andshamrock-inspired designs have become a ubiquitous feature of the day. In the 1798 rebellion, in hopes of making a political statement, Irish soldiers wore full green uniforms on 17 March in hopes ofcatching public attention. The phrase "the wearing of the green", meaning to wear a shamrock on one's clothing, derives from a song of the same name.
2.- Why do irishes celebrate this day ?...