Verse 14 refers to the festival of unleavened bread. Verse 15 refers to the harvest festival at the beginning of the grain harvest. Verse 16 refers to the festival of shelters, or booths, at the conclusion of the annual food harvests, when the fruit harvest was gathered. All the men of the community were to meet together to worship God, bringing offerings. Verse 19 commands that the first corn harvest is to beoffered to God.