This is a misinterpretation of a study on peasant life. It called certain religious days "holidays". What it meant was those days were days they didn't have to work for their lord. Peasants were obligated to work a certain number of days per year on the lord's land. The other days they still had to work their own land. Agriculture was back breaking work and if you weren't working in the fields you were constantly working on things like making cloth, repairing things, preparing food, etc.