In The Netherlands we celebrate Sint Maarten yearly in October. Halloween (it’s comparable) always existed, but never hit mainstream until the last years.
It’s growing in popularity yearly here now. Becoming a cultural thing.
And just as with every cultural thing there’s a time and place for it to emerge and a time and place for change and even disappear.
Not talking about the when and where, I really enjoy Halloween and I hope it sticks around for a while.
Just like Thanksgiving.