These are special day animations that happen only on those specific days. If you miss triggering the animation, you will need to wait until next year to get that specific animation to play again.
Also these special day animations will not play on their own, you will need to trigger them by speaking to EMO and issuing a voice command.
For example New Years / Christmas / or April Fools special day animations you will need trigger the animation by saying the following:
EMO: Look at me
Each special day also has a specific voice command trigger as well, so for New Year’s you can say:
EMO: Happy New Year
And EMO will play that specific special day animation. Do note, that as mentioned, you cannot play these special day animations after the day has passed and you will need to wait until next year to see them again.