Most of us are familiar with the word "re-enact."
verb [ with obj. ]
act out (a past event): bombers were gathered together to re-enact the historic first air attack.
A historical movie might include a re-enactment of the American Civil War, while a fictional movie about the future might include a "pre-enactment" of World War III.
A pre-enactment would be an enactment (the process of acting something out) of something that has not yet happened but one hopes, suspects, or knows will happen. Just as re-enactments are flawed and don't perfectly represent what they intend to, pre-enactments may have missing details or variations from what actually will happen.
This word would be different from "practice" or "rehearsal" because it's not the precursor to a performance. Rather it is the precursor to an actual event that would occur normally but which may be represented by a pre-enactment.
One example involves rituals performed by religious groups—they may pre-enact a reception into heaven or a ceremony that is to take place after death. They do this while still living, even though they believe such an event will occur regardless of their pre-enactment.
Another example is of a couple (probably in a cheesy romantic comedy) that has recently fallen madly in love. They're so caught up that they pre-enact their marriage ceremony, albeit without a few key people and the necessary wardrobe.
However, "pre-enact" doesn't appear to be a widely used word. Is there a similar word that means to act out a future event? If not, is it acceptable to use "pre-enact" despite it not being found in most dictionaries, not even Wiktionary?