They've already told us their plan and we've seen it play out before. Election night is business as usual. Everybody votes, and they tally up the winner (presumably Trump). At the end of the night, the Dems know exactly how many votes they need to win. The exact number of votes they need magically shows up in in the trunks of cars to be counted over the coming days. Once they reach the right number, they claim victory.

What happens after that is the really important part.