This was my latest comment on HN, when, 5 days later, I stumbled upon this comment at the top of a random dicussion, and it was exactly that calendar story I was looking for all these years. So here it is for reference, if anyone happen to be interested :

HN comment : https://news.ycombinator.com/item?id=29071855

calendar story : https://www.sbnation.com/a/17776-football