Today is a very popular holiday in many parts of the world. It's called Christmas, and always occurs on December 25. Red is a common color for that holiday.
It's celebrated on the 25th in many parts of the world, but not all. Swede here, we celebrated 24th.
Also Russia celebrates on January 7th.
With Russia, you were talking about orthodox Christmas, which is a slightly different holiday with a slightly different tradition. The word "Orthodox" should be part of the description.