According to https://www.wolfenoot.com/
it is a holiday recently made up by a (then) 7-year-old
Down Under (where it is now already November 23).
I thought noot meant night but evidently it means
musical note or just note (reference) so instead
of beginning tomorrow at sunset perhaps it begins
at midnight tonight.
This was crossposted to alt.music.s-mclachlan due
to her song Monsters, her Busch beer Superbowl
ad, and her well-known SPCA commercials.
From Monsters:
"And don’t you know that there’s a wolf stalking in sheep’s
clothing tells me he’s the real thing
Think what your life would be missing
if you didn’t have him to sing
To sing about”