Cities across the country have planned events (find the list of locations here) and I've gotten photos from people in small towns all over the place of signs with the ominous warning, "November 4th It Begins."
Now, before we delve into prepping for this, please know that there is every chance this is a tempest in a teapot. It's most likely that anywhere from 20 to 200 people will show up with their signs, chant mean things about the President, maybe throw a rock through a window, and go home. If you aren't near these locations, you probably won't even know it's going on unless you check the news. So, while you should be prepared for anything (as usual), you shouldn't be afraid.
But…considering the fact that this is on every media outlet everywhere (the NY Times actually allowed it to be promoted with a full-page ad on November 1), the possibilities of all hell breaking loose should at least be considered.