It sounds similar to All Saints' Wake, though our festival runs for longer than a day. It's a time where the Twelve are away rather than watching the mortal realm, and the imps and other Voidsent are able to roam free and cause mischief.

[ Era's become rather fond of their antics despite herself. They are quite entertaining. ]

The previous All Saints' Wake the imps made a rather enjoyable haunted house and handed out cookies.