From Longman Dictionary of Contemporary Englishharvest festivalˌharvest ˈfestival noun [countable] especially British EnglishRRCTMC a church service held in the autumn to thank God for the harvest → thanksgiving
Examples from the Corpus
harvest festival• October2000 Many Churches hold a harvest festival at this time of the year.• It was as if a harvest festival were enacted daily, for throughout the hours of market the church bell tolled quietly.• One time the father was away on business, and the stepmother went out to a harvest festival.• Sunday, the following afternoon, the three of us went to a harvest festival at the Athens Fairgrounds.• People used to come here at night at harvest festival time and pray and dance.• One of the courgettes has been allowed to grow into a marrow, ready for our own harvest festival. 