Either they maximize early voting, or they expose themselves to a turnout disaster on election day.
11/3/2020 gave us showers in Seattle, flurries in New England, and sunshine everywhere else. Trump lost by 4.5% instead of the predicted 7.2%.
The great lakes region is prone to nasty storms in November, and the south or mid atlantic could experience soaking rains or a nor'easter. Seems really dumb to leave it to chance.