Concept: “Calendar where you can mark in-game days and track miseries. Contains moon phases and some holidays for worldbuilding.”  
Content: See Concept.
Writing: Such renowned holidays as “St. Anuk Schleger’s Day”, “All Souls”, and “Moose blood day”.
Art/Design: Little faces on the moon, a skull surrounded in Misery, an Illuminated H.
Usability: Print-friendly, easy to mark.