Hi Dad,
Your status at the moment of death determines your fate for all eternity. The last judgment’s purpose is to reveal to the whole world the good and the bad that has happened on earth since creation and to show the love that God manifested in his plan for creation.
The damned and the saved will not be “summoned” from any place. Presently, heaven and hell are not places, since the souls of the departed are pure spirits and do not occupy space. (An exception must be made for the resurrected Jesus and Mary, who are necessarily “somewhere”, since they have their body.)
The “novelty” of lthe Last Judgment is that our bodies will participate in our eternal fate. The saved will inherit a glorified body such as Jesus enjoys since His resurrection; the damned will also resurrect with their bodies in whatever state God has determined.
Heaven and hell at that point will become a place as well as a state. Revelation speaks of a new Heaven and a new Earth. We can only speculate as to what that means.
Meantime, let’s pray every day for the gift of perseverance.
Verbum