Lengthy prison, fines, and a permanent ban from holding office, working in elections, and campaigning for a candidate. Basically you get to vote, that's the only thing you can do (and put stuff up on your lawn/house).
The other option is sending in the National Guard/Military/Federal law enforcement in full force and effectively locking down the city. The left would cry "racist" or "fascist" or "tyrant" or "warlord" etc. Trump can't win this until the mayor, or governor asks for the help.
Riots can be considered violence.
Threatening or inciting violence is against the law and is not covered under the first amendment (to my knowledge).
Thus, the first three could be considered against the law.
Comeondosomething.Barr.meme
Honestly I'm not too worried as "Within a roughly two-hour time frame Tuesday afternoon" I doubt many people printed, voted, and delivered the ballot during that time. Hopefully there's a big shiny sign that says "We fucked up, look at your ballot make sure it's the right one" on their website.
I know the joys of a morphine drip, she wasn't doing much other than starring at the ceiling.