I remember playing Runescape (sue me) back in the day, and they always had holiday events that would last for a certain amount of time. How would you feel about things such as santa hats, jack o lantern heads, scarves, even a decorated tower?
EDIT: thanks to Chocomcbo, he found source from a Q&A video where they talk about Holiday Events. skip to 1:34:00
English
#Destiny
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As someone said before, It would make the game feel alive. But I think a smart thing to do would to use Multinational or Multicultural holidays, and some made up ones to fit the world of Destiny, maybe the day the Golden Age began.