Festal.
The God who made us gives us care and sorrow after our sin. But He has furnished us with divine occasions of consolation by appointing divine feasts. The thoughts they suggest both remind us of God's gifts to us, and promise complete freedom from all our troubles. Enjoying these good things and filled with cheerfulness, we address your magnificence, and, according to the custom of the festival, pay friendship's debt.
Source: Letters (New Advent)