Update to the Nightmare Pile?
I stored the thanksgivings table, brought it back out and it triggered all the tasks again. I did it again just to be sure, and again it triggered the tasks.
Forum Discussion
I didn't see these characters in the menu until completing their "dig for costume" task. So it seems there were some new ones added and/or I had a glitch that stopped mine at some point, and by restoring the decoration re-triggered these un-comleted quests.
