I'm not exactly sure how to prep for this risk but I thought I'd throw it out there since it's something I'm working on today - the market traditionally closes for a day of mourning when a sitting president dies.

I have a sneaking suspicion that this tradition will not be followed this time around if it happens during the week. The chaos around zero and 2 DTE options alone would be insane. Lots of money lost all around.  But still have to plan in case they bumble their way through tradition (if he does die).  If they can delay the announcement and/or event until Friday or Saturday, that would be better for the market.