I have a scene in my game, which I'd like to happen on turn 21 (after 8:20 am).

...but only if the room is not dark.

If the room is dark, I want the script to sort of be 'pending' until the player can see, which would be when the script would finally run.

EDIT:

I answered my own question while typing it out. (Sorry about that.)

bool = CheckDarkness()
if (IsAfter("1:08:20") and not bool) {
  DisableTurnScript (JakeEnters)
  MoveObjectHere (Jake)
  msg ("SPOILER REMOVED")
}