My brother-in-law (born in London, raised Catholic -- his parents were born in Ireland) told me that Christmas parties featuring do-it-yourself entertainment were a tradition in his family. People would sing, recite comical poems, the kids would do Irish step dances, etc. Once a visiting American was invited to participate. Seeing that "Irish" songs were favored, he stood up and sang "The Sash My Father Wore"! Apparently he did this in complete innocence, being just plain ignorant about the political situation. As he was a guest, the family had to treat him politely, but they had many a laugh -- and groan -- about it afterwards.