Monthly themed events

Imagine if everyone could celebrate a universal holiday in a different way? Why not?
Easter, Halloween, Christmas are commemorative dates that are prestigious all over the world. Imagine if in the midst of these festivities you could have an event, for example, a week?
Themed skin, weeks of discounts on NPCs, treasure hunts, temporary bosses and small edits on the map to make events / holidays more themed!
@Zelp, @Alkanov and others ADMS, these are my suggestions!