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It's mostly decorated to attract customers, especially foreigners. But there are millions of Catholic Vietnamese, and they celebrate Christmas. I will visit Vietnamese churches closer to Christmas to see if they have some cool decorations there.

Vietnam is so vast, from North to South. Saigon is ever-hot, Hanoi is chill in winter. Central Vietnam (where I am now) is in between.

Weather in Hanoi:

Screenshot 2024-12-12 at 13-04-06 hanoi weather - Google Search.png