I want to say that for example, on the day of romance and friendship, there is decoration on all the maps with chocolates, chocolates, hearts, etc., and some cosmetics, or also with October, that there could be pumpkins, everything will be a scary environment orange with ghost decoration, this would really be fun!
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quaint cliff
tropic willow
to add onto this, i think it could be kinda cool to have tiers of heck only accessible on holidays like christmas. if you fail to complete it before the holiday is up, you gotta wait until next year to try again, but if you complete it, it stays and you can try to get a better time without having to wait for it to come back