Would it be possible to still have the event's NPC available for at least a week after the event has ended? I think that was the case for the anniversary event, but the past Halloween event, the NPC is gone right after SC. It kinda weird to be able to get event items right until SC (since mobs drop dark tokens/candies), but unable to exchange it for anything after the SC, which makes the event items redundant.
I'm not sure if it possible, but I still see NPC malady in kerning. I haven't talk to her yet maybe u can give a try