Due to the Irish potato famine (and many other reasons) there is a high population of Irish-Americans in the USA. These people immigrated from Ireland to the United States, bringing along their own culture, traditions, and holidays.
St. Patrick's day is not a national holiday in the U.S. It is a Catholic feast day. As they say, everyone is Irish on St. Patrick's Day.
saoire / lá saoire
Ireland does not celebrate Thanksgiving at all. It is US and Canadian holiday. Nobody else celebrates it. The Irish living in America, celebrate Thanksgiving the same as everyone else.
robin
Easter
The Irish Gaelic language has no letter 'y'.
Halloween
Ireland is a Christian country, so Christmas is an important holiday for Irish people.
USA
When the holidays come.
Easter Sunday.
Type your answer here... an Irish holiday