Hello! We noticed the issue as well, and we’re working right now to put this in a bit of a nicer state through the holiday weekend. While the event is supposed to clean up entirely at this point, we agree its a bit abrupt for anybody that might still have Necrotic Runes to turn in.
We’ve just re-enabled the turn-in NPCs, and will leave them up through the weekend, but when they go away again on Monday, that will be the end, so turn those runes in now!