Well, you are right that 1 Thessalonians 4 is about the rapture of the Church. It happens at the trump of God or voice of God
You must be unaware of this verse. It's about the second fold. It occurs at the last trump which is blown on the feast of Trumpets.
1 Corinthians 15
51 Behold, I shew you a mystery; We shall not all sleep, but we shall all be changed,
52 In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed.
The gathering from heaven and earth is the Church being gathered from heaven as they are the first fold and the 12 tribes are gathered from the earth as the second fold. All return to heaven at the sixth seal for the marriage supper and are the great multitude seen in Revelation 7 and Revelation 19.
The last Trumpet is Blown at the Second Coming of Christ and not one day before His Return.
“Immediately after the tribulation of those days the sun will be darkened, and the moon will not give its light; the stars will fall from heaven, and the powers of the heavens will be shaken. Then the sign of the Son of Man will appear in heaven, and then all the tribes of the earth will mourn, and they will see the Son of Man coming on the clouds of heaven with power and great glory. And He will send His angels with a great sound of a trumpet, and they will gather together His elect from the four winds, from one end of heaven to the other.
Pay attention to "the stars will fall from heaven" = Acts ch2
17‘In the last days, God says,
I will pour out My Spirit on all people.
Your sons and daughters will prophesy,
your young men will see visions,
your old men will dream dreams.
18Even on My menservants and maidservants
I will pour out My Spirit in those days,
and they will prophesy.
19I will show wonders in the heavens above
and signs on the earth below,
blood and fire and billows of smoke.
20The sun will be turned to darkness,
and the moon to blood,
before the coming of the great and glorious Day of the Lord.
21And everyone who calls on the name of the Lord will be saved.’
Revelation ch12
7Then a war broke out in heaven: Michael and his angels fought against the dragon, and the dragon and his angels fought back.
8But the dragon was not strong enough, and no longer was any place found in heaven for him and his angels.
9And the great dragon was hurled down—that ancient serpent called the devil and Satan, the deceiver of the whole world.
He was hurled to the earth,
and his angels with him.