@evan Here am I like "what on Earth is Kings Day?". Even Google is not definitive for my search. Simple search mentioned Netherlands April 27. Adding Canada drove that down enough to let me figure out that Epiphany (which I'm also largely ignorant of) might/is also known as Three Kings day?
I think I've avoided learning about all the "serious Christian" (eg Catholic, Anglican, or any of the Orthodox Christian churches, in my mind). Not that I've learned much about Protestant ones either.