Is Christmas a possessive pronoun

The word Christmas is not a pronoun, it is a noun, a singular, proper, abstract noun or an adjective. The possessive form is Christmas's. Example uses:

I like looking for and finding the right word for a particular phrase or statement.
I may chop, crop, slice,dice, mix, mince or evenly blend different forms of words to construct my statements,
but I have never given any thought to
the word forms of Christmas.
That question can only be answered from the terms of context.

There are all sorts of opinions - and a style manual is exactly that, an opinion.

For Merriam Webster, the form changes under all sorts of circumstances (see ‘classical names’, to go back to our Jesus discussion):

https://www.merriam-webster.com/grammar/what-happens-to-names-when-we-make-them-plural-or-possessive

And when I asked my friendly household AI to show literary examples, it had this to say:

4. Proper nouns ending in s: In William Shakespeare’s “Henry VIII”, the character of Cardinal Wolsey is described as having “the Fothergills’ loyal support”.
These examples illustrate how possession is shown in nouns that end in s, whether singular, plural, compound, or proper. In each case, the possessive apostrophe is added to indicate ownership or relationship.

Further, the ‘Grammarbook.com’ tells us that there is no ‘right’ answer:

https://www.grammarbook.com/blog/apostrophes/apostrophes-with-words-ending-in-s/

As I said, I consider a lot of this to be opinion. I’ll stick with what I was taught back when even public education was still pretty decent; and what I’ve seen in a lifetime of reading accomplished English language writers.

Everyone who speaks English as a native language has used the ‘singular they’ without thinking, many times. I don’t even recall it ever being an issue until the relatively recent kerfuffle over pronouns as they relate to sexual identity.

Natural language is a lot more than strict grammatical rules; a lot of it - and its efficacy - comes down to collective, accepted usage - which is constantly evolving.

(And now that you’ve shown yourself as not only very small but insulting as well, I’m finished. Have a nice holiday.)

I think I’ve always gone with ‘ignorami’; but both appear to be acceptable:

https://www.merriam-webster.com/wordplay/ignoramuses-or-ignorami-ignoramus-plural

Language is darn complicated...

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