the Seven Trumpets of Revelation are simply indicators for the punishments or the information described, as they happen. I do not think that an actual trumpet blast will precede any of them. Not as heard on earth anyway.
The Last Trumpet will be the call for all the dead to rise, to stand before God in Judgment. Revelation 20:11-15
The Last Trump that Paul cites in 1Cor 15:52, is that same Trump, proved by how it is only then that Death will be no more. Revelation 21:4
AFTER the Millennium.
Provided the Millennium is correctly understood as the Church Age.
At the end of the Great Commission the "testimony" of the Two Witnesses is finished.
That is the end of the Great Commission and the Church Age. It is followed with Satan
"overcoming" those Two Witnesses for 3.5 days which represents the Great Tribulation
just like the 3.5 "times" and the 3.5 years and the 3.5 "watches of the night" all represent
the Great Tribulation "Kingdom of Heaven [Mat 25:1]
Remember the Seventh Trumpet is also the 3rd Woe.
So there was a 1st Woe (as Satan is loosened) and a 2nd Woe
as the Second Beast is destroyed... and then the 3rd Woe or Seventh Trumpet
And the Seventh Trumpet has some awesome EVENTS associated with it.
Rev 11:15 And the seventh angel sounded; and there were great voices in heaven,
saying,
The kingdoms of this world are become the kingdoms of our Lord, and
of his Christ; and he shall reign for ever and ever. And the four and twenty elders,
which sat before God on their seats, fell upon their faces, and worshipped God,
Saying, We give thee thanks, O Lord God Almighty, which art, and wast, and art to come;
because thou hast taken to thee thy great power, and hast reigned. And the nations were
angry, and thy wrath is come, and the time of the dead, that they should be judged, and
that thou shouldest give reward unto thy servants the prophets, and to the saints, and
them that fear thy name, small and great; and shouldest destroy them which destroy
the earth. And the temple of God was opened in heaven, and there was seen in his
temple the ark of his testament: and there were lightnings, and voices, and thunderings,
and an earthquake, and great hail.
.