vital ledge
A way to toggle event skins / enemies at any time. Of course you'd have to 100% the event to unlock this function for each event you wanna toggle. Here's a couple ways this could work.
1: if you 100% an event you can toggle it using a form of settings menu [like a variant of book or something] and be able to do the event themed quests. But the quests wouldn't contribute to anything unless the actual event was active. Would also spawn in the event's enemies.
2: an item that allows the spawning of event enemies or elite enemies. Could implement some extra challenges for different times. It would be a form of book/menu that would have a page for each event and these pages would be unlocked by 100%ing their respective events.
olive iris
umbral flame