The Moveable Feast: calendrical rights and their importance

Holy days and feast days were amazingly important in pre-modern and pre-industrial society. Our own holidays pale in comparison. I've missed many in the last few years, due to work or travel. For us, holidays aren't really that special. They're important when we are children, and then they become less and less so as we age. I would make the argument that the same is not true of medieval people, and the same need not be true of the folk of your fantasy game-world either.

From my own research and readings, calendrical rights played an all-important role in the medieval mind. They sometimes marked days of major labor (for instance, those rights associated with the harvest feasts wherein even freemen had to work on their lord's lands) and sometimes instead marked days of major remittance. Either way, they were almost always accompanied with drinking and eating beyond what was considered the acceptable amount. These were the feast-days, the days when social barriers were relaxed, food was abundant, and a festival atmosphere reigned.

A third type of holiday was the common and secular market day, which generally happened as often as once a week and as rarely as once a month in large towns and villages in England and France. Market days, while not of the same power as a regular holiday, still caused many hundreds of outsiders to pour into a center of distribution and engage in a festival-like expression of commerce. These gatherings were not as liminal as the true holy days, but they still provided an outlet. Indeed, a yearly market (such as the Champange Fairs) might last for several days and have the feeling of a true holy day! In the yearly market towns the arrival of foreigners from every corner of the globe was certainly a chance to trade with and speak to merchants from regions that one would otherwise know nothing about.