…assuming you have a trailer.
The night before a shoot, check all costumes, props, locations, actors, gear, food, and crew. make sure everything’s ready. Make sure batteries are charging, tapes are striping*, etc.
Prepack the car.
Double-check everything.
Call other people to make sure they’re prepared, too.
I used to have a checklist, but the last big project kinda scotched that idea. On the other hand, the last big project’s “checklist” was “Bring the trailer. Everything’s in the trailer.”
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* I’m keeping this in here for purposes of historical amusement. Tapes were pre-striped to create a single timecode across the entire tape.