Valentine's Day

^{Deut 12:28} Obey and pay attention to everything I am ordering you to do, so that things will go well with you and with your descendants after you forever, as you do what Adonai sees as good and right.
(iii) ²⁹ “When Adonai your God has cut off ahead of you the nations you are entering in order to dispossess, and when you have dispossessed them and are living in their land; ³⁰ be careful, after they have been destroyed ahead of you, not to be trapped into following them; so that you inquire after their gods and ask, ‘How did these nations serve their gods? I want to do the same.’ ³¹ You must not do this to Adonai your God! For they have done to their gods all the abominations that Adonai hates! They even burn up their sons and daughters in the fire for their gods!"

That pretty much sums up why we stick to the Holy Days written about in Scripture. It really doesn't matter what the world's holidays mean to you and I.  All that matters is what these days/traditions/rituals mean to YHVH, the God of all gods and Creator of all.