Epiphany is this week (january 6) - how is it celebrated?

I’m not christian, but I’m nevertheless curious about the holiday. I more-or-less understand what it’s commemorating.

- is it more of a Catholic celebration, or do most/all other Christian variants celebrate it?

- I see that it’s considered a ‘festival’ – do you celebrate it by special meals? Additional prayers?

- Is this considered a major holiday, like Easter?

- Is this called for in the New Testament (like Sukkot is called for in the Old testament), or is this an outgrowth of traditional practice?