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None, you should appreciate people in your life on a daily basis and not because some holiday tells you to do so.
Whilst I don’t want to argue about whether the appreciation of people in your life should be encouraged by a celebration day, I would like to point out that holidays aren’t specific to appreciating people . They can also be for appreciating things , such as natural phenomenon.
Personally I’d prefer winter and summer type celebrations on the equinox and solstice than Christmas and a seemingly random (in my country) public holiday at a point in the summer where it isn’t that warm anymore.