harvest festival 
noun
A celebration of the annual harvest, especially (in Britain) one held in schools and as a service in Christian churches, to which gifts of food are brought for the poor: an old dark church, full of leftovers from the harvest festival...
- Foodstuffs taken to church for the harvest festival are generally given to charity.
- They have donated a basket of bread for our harvest festival for the past couple of years.
- At harvest festival, Grant's the bakers would provide a massive bread loaf in the shape of a sheaf of corn, propped up on the altar.