The Millennial Kingdom is when Christ tabernacles with humanity until the White Throne Judgment after which the New Heaven and Earth are created.   

The Millennial Kingdom is established at the end of the Day Of Wrath which begins with the appearing of Christ Jesus in the air and the catching away of the saints, dead and living.   

And his feet shall stand in that day upon the mount of Olives, which is before Jerusalem on the east, and the mount of Olives shall cleave in the midst thereof toward the east and toward the west, and there shall be a very great valley; and half of the mountain shall remove toward the north, and half of it toward the south. - Zec 14:4 On the day that Jesus returns: → the dead in Christ are raised and translated → the living in Christ are translated → both are caught up into the air with Jesus the Day Of Wrath is unleashed upon the earth → at the end of that day, Jesus sets foot on the Mount of Olives → the Millennial Kingdom is established.

And it shall be in that day, that living waters shall go out from Jerusalem; half of them toward the former sea, and half of them toward the hinder sea: in summer and in winter shall it be. - Zec 14:8 The Living Water is the Holy Spirit who will be authorized by Christ Jesus to fill the earth.

And the LORD shall be king over all the earth: in that day shall there be one LORD, and his name one. - Zec 14:9 There never has been and never will be but one Lord and that is the Holy Spirit filled Christ Jesus.

All the land shall be turned as a plain from Geba to Rimmon south of Jerusalem: and it shall be lifted up, and inhabited in her place, from Benjamin's gate unto the place of the first gate, unto the corner gate, and from the tower of Hananeel unto the king's winepresses. - Zec 14:10

And men shall dwell in it, and there shall be no more utter destruction; but Jerusalem shall be safely inhabited. - Zec 14:11 Christ Jesus will return to protect and deliver Jerusalem which will be the capitol of His Kingdom.

And this shall be the plague wherewith the LORD will strike all the people that have fought against Jerusalem; Their flesh shall consume away while they stand upon their feet, and their eyes shall consume away in their holes, and their tongue shall consume away in their mouth. - Zec 14:12 This is what precedes the establishment of the Millennial Kingdom - the Day Of Wrath.

And it shall come to pass in that day, that a great tumult from the LORD shall be among them; and they shall lay hold every one on the hand of his neighbour, and his hand shall rise up against the hand of his neighbour. - Zec 14:13 There willbe worldwide chaos as the children of Satan are terrified at the appearing of the Lord.

And Judah also shall fight at Jerusalem; and the wealth of all the heathen round about shall be gathered together, gold, and silver, and apparel, in great abundance. - Zec 14:14 The focus and hotspot of the battle between the forces of Satan and our Lord will be Jerusalem.

And so shall be the plague of the horse, of the mule, of the camel, and of the ass, and of all the beasts that shall be in these tents, as this plague. - Zec 14:15 Human and animal life will be destroyed in this battle which starts out as human against human but becomes a battle of corrupted humanity against Christ Jesus when He intervenes.

And it shall come to pass, that every one that is left of all the nations which came against Jerusalem shall even go up from year to year to worship the King, the LORD of hosts, and to keep the feast of tabernacles. - Zec 14:16 But there will be humans who never worshipped the beast that survive the Day Of Wrath.     These are able to live as subjects of the King.      U\It will be required that they keep the feast of tabernacles.

And it shall be, that whoso will not come up of all the families of the earth unto Jerusalem to worship the King, the LORD of hosts, even upon them shall be no rain. - Zec 14:17 It will no longer rain on the just and the unjust but only on those who honour the King.

And if the family of Egypt go not up, and come not, that have no rain; there shall be the plague, wherewith the LORD will strike the heathen that come not up to keep the feast of tabernacles. - Zec 14:18 Unthankfulness and self-worship will result in hardship.

This shall be the punishment of Egypt, and the punishment of all nations that come not up to keep the feast of tabernacles. - Zec 14:19 Egypt is symbolic of unbelievers.

In that day shall there be upon the bells of the horses, HOLINESS UNTO THE LORD; and the pots in the LORD's house shall be like the bowls before the altar. - Zec 14:20 There will be glory and majesty throughout the Kingdom.

Yes, every pot in Jerusalem and in Judah shall be holiness unto the LORD of hosts: and all they that sacrifice shall come and take of them, and seethe therein: and in that day there shall be no more the Canaanite in the house of the LORD of hosts. - Zec 14:21 Worship and adoration of the King of the universe will be world-wide.

So shall you know that I am the LORD your God dwelling in Zion, my holy mountain: then shall Jerusalem be holy, and there shall no strangers pass through her any more. - Joe 3:17 The Holy Spirit will dominate the atmosphere of the Kingdom.

And it shall come to pass in that day, that the mountains shall drop down new wine, and the hills shall flow with milk, and all the rivers of Judah shall flow with waters, and a fountain shall come forth of the house of the LORD, and shall water the valley of Shittim. - Joe 3:18 Blessings upon blessings will flow in the Kingdom of our Lord.

Egypt shall be a desolation, and Edom shall be a desolate wilderness, for the violence against the children of Judah, because they have shed innocent blood in their land. - Joe 3:19 The former kingdoms are destroyed at the return of Christ.

But Judah shall dwell for ever, and Jerusalem from generation to generation. - Joe 3:20 The seat of our Lord's Kingdom.

For I will cleanse their blood that I have not cleansed: for the LORD dwells in Zion. - Joe 3:21