since you asked... I'm currently wrestling with the meaning and value of traditional jewish calendars (passover, feast of booths, yom kippur) and christian calendars (pentecost, lent, advent) over the modern consumer ones (pi day? talk like a pirate day?) ... but the 'wrestle' bit comes from how to do this well, and how much is law over grace, and how to be faithful to the bible year and seasons without getting all legalistic about it
I hope you get lots of answers and lots of inspiration for longer posts. Hats off to you for persisting!