The Feast of Tabernacles is for seven (7) days: The First Day is an Annual Sabbath (sunset Wednesday 16th October to sunset Thursday 17th October. The Church of God under the New Covenant is required to gather only on the 1st Day of the Feast of Tabernacles.
Matt 18:20. The focus of the Church of God during the Feast of Tabernacles is to intensify the carrying the message of the gospel of the kingdom of heaven to the world.
Matt 28:19-20.
Mark 16:15-16).