Zechariah 14 speaks of the celebration of the feast days along with the sacrifices, which will both be reinstituted in the Millennium
Zechariah 14:16-18
In the end, the enemies of Jerusalem who survive the plague will go up to Jerusalem each year to worship the King, the Lord of Heaven’s Armies, and to celebrate the Festival of Shelters. 17 Any nation in the world that refuses to come to Jerusalem to worship the King, the Lord of Heaven’s Armies, will have no rain. 18 If the people of Egypt refuse to attend the festival, the Lord will punish them with the same plague that he sends on the other nations who refuse to go.
Verse 21:
In fact, every cooking pot in Jerusalem and Judah will be holy to the Lord of Heaven’s Armies. All who come to worship will be free to use any of these pots to boil their sacrifices. And on that day there will no longer be traders in the Temple of the Lord of Heaven’s Armies.
Also, Isaiah 56:7
I will bring them to my holy mountain of Jerusalem
and will fill them with joy in my house of prayer.
I will accept their burnt offerings and sacrifices,
because my Temple will be called a house of prayer for all nations.
Isaiah 66:23
And it shall come to pass
That from one New Moon to another,
And from one Sabbath to another,
All flesh shall come to worship before Me,” says the Lord.
We will be keeping all Sabbaths and all New Moon festivals in the Millennial period on earth.
Also read Ezekiel chapters 44-46