The word for this is anamnesis. Christ's anamnesis is not simply a passive process of memory or memorialisation, but a process or act by which we actually enter into Christ's Passion. His Passion is truly made present for us.
I guess that you haven't come across this concept: however it needn't be alarming. At Mass Jesus gives His very self to us for our food. This is His one and only Sacrifice at which He is both High Priest and Victim.
After that: the idea that we are present at His Passion - while profoundly true - is almost an afterthought.
God is not bound by time and space: making us truly present and truly a part of the greatest moment in both history and eternity is nothing to Him.