In Chapter 4 of Revelation, John paints a glorious picture
of Heaven with the Throne of God surrounded by 24 other thrones. Around
the throne were 4 living creatures who continually gave praise and thanks to God
while the 24 elders on the thrones worshiped him. Before the Throne
were seven Lamps and a Sea of Glass.
In Chapter 5 of Revelation, Jesus, the Lamb or God is
found worthy to open the scroll containing the names of those purchased from
among men with His Blood. Millions of angels surrounded the throne giving
praise to the Lamb saying "Worthy is the Lamb to receive power and wealth,
wisdom and strength, glory honor and praise."
In Chapter 6-7, Christ begins to open the Scroll which has
seven seals. When he has finished, there is silence in heaven for half an
hour (Rev 8:1). As the Seventh seal is about to be opened, John sees an
angel seal 144000 Jews. A Great Multitude appear in heaven from
every nation, tribe, people and language wearing white robes. They have
gone through the Great tribulation and have been redeemed from the Earth.
The saints are redeemed from the earth (harvested /
raptured) after the sixth seal (Rev Ch 7). The Bowls of God's wrath are
also poured out after the sixth seal (Rev 6:17). The saints are in heaven when this occurs (Rev 15:1-4).
These events must, therefore, be part of the Seventh Seal.
The Trumpets of Revelation (chapters 8-11)
signal the commencement of the Judgment on the Earth culminating with the The Kindom of the World becoming the Kindom of Our Lord and of his Christ.
Just as the Harvest was after the Sixth Seal, The day of the Lord occurs after the Sixth Trumpet.
It is unlikely that the
rapture occurs before the fifth
trumpet (the first woe) as the first woe lasts five months and there is no more
than 75 days between the rapture and the seventh trumpet (Daniel Ch 12)

The rapture of the saints is said to be at the Last Trumpet
1Co 15:51-52 says "Listen, I tell you a mystery: We will not all sleep, but we will all be changed in a flash, in the twinkling of an eye, at the last trumpet. For the trumpet will sound, the dead will be raised imperishable, and we will be changed."
The Seventh Seal, the Seventh Trumpet and the Seventh Bowl correspond to
the end of this Age and the beginning of the Millennium.
Included in the Seventh Trumpet are: The Harvest of the Believers, the third woe, the seven Bowls of Gods Wrath on the Nations, the fall of Babylon, the Day of the Lord and the Battle of Armageddon.
The saints are no longer on Earth when the Bowls of God's Wrath are poured out upon the Nations of the Earth (Rev 15:1-4). The Harvest of the Earth occurs in Revelation chapter 14 but the Nations are still on Earth in Chapters 15-19.
The Nations are still on Earth during the Millennium and in Eternity. Who are these people? In Revelation Chapter 15:1-4, a Great Multitude sings praise to God. They have been victorious over the Beast; they did not worship his image or recieve his Mark. They sing "You alone are Holy, All Nations will come and worship before you". Then the Angels begin to pour out God's Wrath.
Christ comes with His army of Redeemed Saints to defeat
the Beast and the False Prophet and to Strike Down the Nations (Chapter 19)- at least those
who have the mark of the beast. In order to do this, He (Christ) must have redeemed the Saints from the Earth first.
The second coming, therefore, has two aspects. The first is the unpredictable, long awaited coming of the Lord in the Clouds to redeem his Church at a day and an hour known only to God. The second is the much dreaded 'Day of the Lord' when Christ comes with an army of believers to strike down the Nations, the Kings of the Earth, the Beast and the False Prophet bringing to an end The Great Babylon (the Worldly System) in a final battle called 'the Battle of Armageddon'.
The Harvest of the Earth, the Wedding Feast, the Judgment
on the Nations and the Day of the Lord occur in quick succession over a short
period of time. While it is not clear from Revelation just how long
it is between these events, the Book of Daniel (Dan 12:11-12) would suggest that
these events span no more than a few months (75 days). On an eternal time scale or
from the perspective of the distant past, they seem to occur all at once or instantaneously
at the 'Last Trumpet' (1Cor 15:51-2).