According to "A Girl for all Seasons" the cultural way to commemorate the twelfth day after Christmas would be to re-read William Shakespeare's Twelfth Night. I have started it but as I haven't read any Shakespeare since Leaving Cert in school it will take me a while.
Confession time :- I bought a school textbook copy that has all the explanations down the side of the page. I am really enjoying it, much to my surprise. The last time I was too focused on what might come up in the exam. Now I can appreciate it as a piece of drama.
Will comment further when I get it finished!