Halloween Event Idea: Namahage visit the astral plane or the kitsune den. Namahage are Yokai that can be compared to Krampus. They go in in pairs of one red one blue from house to house and ask if there are any naughty children. Or they visit newly weds and the married couple has to host a dinner for them. This is still a tradition in some areas of Japan where the men of a village dress up as Namahage and scare lazy children.
Now the possible events:
a) If Kinu and Kyoko are still in the astral plane, Kyoko asked you to dress up as one to scare Kinu and her siblings. She does recognize the fraud and reacts according to her personality points. As a Inari shoji she plays along honoring your efforts, or busting you as a Kistsune Hime
b) If Kinu and Kyoko are freed, the males of the den and you dress up as namahage and visit adult Kinu, her siblings and the other females that are pregnant or you had children with. Adult kinus reaction depending on personality again.
c) If you married Kyoko, the men dress up and you actually have to host a dinner/party,
d) If you are a Kitsune yourself, Keros straight up asks you if you want to be his Namahge buddy. Then he (temporarily) transforms you into one and you two "scare" the entire den.
As a spooky part for b and c: There are 2 more dressed up persons and it turns out that these are actual Namahage.
As for the naughty part, let the writers do, what they do best.
To the writers:
If you do implement Namahage, don't forget their typical phrase "Waruiko wa inee ka?" meaning "Are there any bad kids around?"
For reference:
I got these informations from the youtuber "Gaijin Goombah media". It is from his video about the Goss Harag. The relevant information starts about the 5 minute mark.