A NEW TESTAMENT PERSPECTIVE:
The apostle Peter observes that the Old Testament prophets spoke concerning the salvation and grace that are ours in Christ and the glory that is to follow (1 Peter 10-11). In the gospels, Jesus also informs a Samaritan woman (John 4:23) that worship is no longer restricted to any specific geographical location (e.g. Jerusalem and its temple) or to set times and seasons, as was commanded under the Old Covenant dispensation (Deut 16:16). In addition, Paul informs Christians that the Old Testament annual Sabbaths were only shadows of future realities (Col 2:17).
THE INGATHERING OF ALL NATIONS:
From this New Testament perspective, we can see that the prophet's use of this particular Old Covenant festival serves to illustrate the in-gathering of the nations that is to take place at the Lord’s return: the Feast of Tabernacles being that great feast of in-gathering which closed the religious year for ancient Israel (Exodus 23:16).
The eight day festival of Sukkot (Tabernacles) was a time of thanksgiving and great rejoicing before the Lord. The tabernacles or booths, themselves, were intended to bring to mind how God had sustained the nation of Israel during the forty years wilderness wondering (Leviticus 23:43) and were a reminder to them also not to overlook the Lord’s provisions now that they had entered the land of promise being blessed with rain in due season and regular bountiful harvests as a result.
This autumn festival coincided with the latter rain, which brought in the fruit harvest. Zechariah therefore employs the thought of universal observation of this Old Covenant Festival to picture an end time 'harvest' of souls (Revelation 14:14-16), when “many nations shall be joined to the LORD” and when the Lord himself will tabernacle with his people (Zechariah 2:11; Revelation 21:3). Those who fail to share in this latter 'harvest' are thus presented as falling outside of God's provision (Zechariah 14:18-19).