feast day 
noun
A day on which a celebration, especially an annual Christian one, is held: on feast days a High Mass was sung the feast day of Saint Mark...
- The Maltese love festivals, and between May and October almost every town and village in Malta and Gozo celebrates the feast day of its patron saint.
- Every city or town also celebrates the feast day of its patron saint with processions, dancing, and bullfights.
- Each village celebrates the feast day of its patron saint.