What days did people celebrate holy days in Medieval times?

The number of church holidays varied with time and place.

There were a number of holidays celebrating events in the life of Jesus or history of the Church, these included the following:

• Christmas
• The Feast of the Holy Innocents
• The Feast of the Circumcision
• Twelfth Day
• Candlemas
• Shrove Tuesday
• Ash Wednesday
• The Feast of the Annunciation
• Palm Sunday
• Good Friday
• Easter
• The Feast of the Ascension
• Pentecost

Most of these were important feasts for all Christians, regardless of where they were.

There were other feast days, including every Sunday, regardless of whatever else was going on, including Lent, so Sundays in Lent were feast days, and Lenten fasts were not necessarily observed.

There were saints' days, which were days designated as feasts for one saint or another. There being far more saints than days to be their feasts, any given day was most probably a feast day for some saint or other. These days were celebrated in places where the saint had some significance, such as being patron saint of the local church, ruling family, local noble family, or local church.