The Word of God is not a fast food doctrine bar, and one cannot make doctrine up that is not totally correlating with the Living Oracles which were committed "only" to the namesake people of the New Man name, to show His one plan for the redemption of the sons of Adam.
We learn doctrines from the "Schoolmaster/Tutor", which was given to teach and instruct us His plans for us.
The "last trump" is not found in Revelation, which Paul speaks of for the call to "be gathered together unto the LORD as the ingathered harvest of earth, called "Pentecost", but is found in the Living Oracles, in Numbers 1`0:1-7. The silver trumpets Moses was shown in heaven were typed by Him in the Oracles, according to the pattern shown, and they are used to call the congregation to be gathered together before the LORD, at the doors of the tabernacle/temple.
One blast of the two together calls the elders, and two blasts of the two together calls the entire congregation to be gathered together before the doors, to hear the instruction of YHWH.
You'll find the instructions the congregation is given in Isaiah 26:19-21, when they are gathered together to Him before His temple doors, before that day of tribulation can come [Isaiah 27].
You'll find His commandment to "gather my people together unto Me", before He judges the earth, in Psalm 50.
You'll find what the congregation does, behind the shut doors of His temple, in the Oracles of Leviticus 8, which is to be dressed in holy garments and celebrate the consecration to priesthood dressed in New Man garments of priesthood [bodies made for Glory].
You'll also find how long the consecration to priesthood celebration goes on, behind the shut doors, in Leviticus 8 [one week].
You'll find the LORD "taking away out of the midst of the earth the saints, which are His congregation, before He judges the inhabitants of the whole earth, and their hearts melt for fear, in Psalm 75:2,3 [in the original Hebrew].
You'll see that there is no way anyone can have a doctrine that is new, which is not found and revealed in the Living Oracles committed to the namesake people of the New Man name, when you learn that unto the Jews only, who bear the name of the New Man -who is YHWH the Word come in flesh- when you are instructed in the Oracles committed to His namesake people.
Hbr 5:12
For when for the time ye ought to be teachers,
ye have need that one teach you again which [be]
the first principles[abc's] of the oracles of God; and are become such as have need of milk, and not of strong meat.
Rom 3:1,2 ...What advantage hath the Jews... Much every way: chiefly, because
that unto them were committed the oracles of God.
The gathering together unto Christ is called by two heavenly trumpets type din silver by Moses, which blow once, and then a second time in the series of two, ordained to call the entire congregation to be gathered together unto the LORD, before His temple doors.
We who are alive and remain shall be changed at the last blast of the two gathering together to the LORD trumpets, and we shall meet them in the air/heavens, and so shall we ever be with the LORD.
First thing we do is -we party!