They no almost no one is going to show up , just as no one attended his campaign speeches, so they need to have an excuse to explain why the inauguration is going to look like some unpopular nerdy freshman’s birthday party.
When Clinton would fly into the military base that my husband was stationed at, no one would go out to meet him. It looked deserted. They stayed indoors and avoided having to even see him, let alone be forced to salute him.
So the next time he flew in, all personnel were told to stay indoors from the time he landed until he left the base. Those that had to be out to put the steps up to AF 1 or were at the gate had to be at their stations, but the rest of the base looked like a ghost town.