I think it really comes down to only 2 possible scenarios:
1 ) Donald J. Trump will be declared winner of the 2020 Election and a massive party will break out on the National Mall.
or
2 ) Joe Biden will be fraudulently installed as President in violation of the US Constitution, triggering an immediate intervention by the US Military acting under declaration of the Insurrection Act and with the full support of 1.5 - 2 Million Patriots in attendance.
If it were to be #2 (fitting description), I don't think POTUS or the military would want American citizens in harm's way, nor in their OWN way, while they start the mopping up project. Inviting citizens into a Ground Zero area, where arrests and snatch operations would be in full swing would be the height of irresponsibility, so if either of these are the options, it would almost certainly be #1.
Antifa and pro Biden people will be there, anyway.
It's a powder keg, regardless, and presence of uniformed US Military soldiers protecting the crowd will actually de-escalate potential hostilities.
Traitors are not going to be hauled out in front of the crowd, but would be escorted out through tunnels and backdoors of the Capitol Building.
I mean at this point is there any "Pro Biden" people? They just didn't want Trump. I can't see more then a handful of democrats who are just Biden lovers... specially ones that are willing to mix it up with angry pissed off Trump supporters.
ANTIFA and BLM will probably be there, but considering they tuck tail and run when faced with any opposition that is real... I don't see them as a threat.
What I worry about is some type of false flag attack.