What will be the national fulfillment for Israel of the Feast of Succoth, (Tabernacles)?
And it shall come to pass, that every one that is left of all the nations that came against Jerusalem shall go up from year to year to worship the King, Jehovah of hosts, and to keep the feast of tabernacles. And it shall be, that whoso of all the families of the earth goes not up unto Jerusalem to worship the King, Jehovah of hosts, upon them there shall be no rain. And if the family of Egypt go not up, and come not, neither shall it be upon them; there shall be the plague wherewith Jehovah will smite the nations that go not up to keep the feast of tabernacles. This shall be the punishment of Egypt, and the punishment of all the nations that go not up to keep the feast of tabernacles. Zechariah 14:16-19
Because the Messianic Kingdom, the Millennium, will be the fulfillment of the Feast of Tabernacles, verse 16 states that it will be obligatory on all the nations that came against Jerusalem to worship the King, Jehovah of hosts, and to keep the feast of tabernacles. Every year each nation in the Kingdom will have to send a delegation to Jerusalem. Under the Law of Moses it was obligatory for Jews only, but under Millennial Law, it will be obligatory for all the nations. Verses 17–19 state that there will be punishment for those who disobey. If a nation fails to send a delegation to Jerusalem to observe this feast, they will be punished by a drought.
Just as the Feast of Tabernacles was a time of rejoicing following the affliction of the Day of Atonement, even so the Kingdom is to be a time of rejoicing following the afflictions of the Great Tribulation.
Excerpt from Dr Arnold G. Fruchtenbaum: MBS120 The Feast of Succoth (Tabernacles) (San Antonio, TX: Ariel Ministries) pg 30