A piece of history seems appropriate.
Near dawn February 23, 1861, President-elect Abraham Lincoln arrived secretly by train in Washington, D.C. at 6 a.m. because of a rumored plot to assassinate him as he passed through Baltimore. Lincoln was criticized for and later regretted the furtive manner of his arrival, but his advisors believed the danger was genuine. By the time of Lincoln’s inauguration on March 4, 1861, seven states had seceded, and the Confederate States of America had been formally established.

Reported on Politico Nightly
Top lawmakers say they are increasingly alarmed by a rash of new threats that could once again endanger their lives.  Senators received a briefing today from representatives of the Secret Service, and the departments of Defense and Homeland Security, and a key group of House Democratic chairs separately met with the FBI.

“Based on today’s briefing, we have grave concerns about ongoing and violent threats to our democracy,” that group of Democratic chairs said in a cryptic statement after the meeting today. The briefing included the chairs and other top members of the House Oversight, Judiciary, Homeland Security, Armed Services and Intelligence panels. “It is clear that more must be done to preempt, penetrate, and prevent deadly and seditious assaults by domestic violent extremists in the days ahead,” the statement said.

The lawmakers voiced their concerns moments after a public FBI and Justice Department briefing revealed their belief that the Jan. 6 violence could be part of a much graver, well-organized “seditious conspiracy.” A Justice Department “strike force” is seeking to assemble a sedition case against some of those involved in last week’s riot at the Capitol.

As I posted on January 10 “Trump is not done.”  I heard one rioter say he would die if need be to to ensure Donald Trump is inaugurated on January 20.  January 17 and January 20 are the two days that are anticipated to be the next assaults on the Capitol.

An inauguration inside a secured building viewed by the public on television seems like a likely scenario on January 20 to ensure the safety of Joe Biden and Kamala Harris.