Your local county court web site might have a schedule.
I’ve been looking for mine unsuccessfully do far.
But yeah, you can probably just walk in to the courthouse go through the metal detector and sit in a court gallery.
Yes, America must open court rooms to the public while a trial is being conducted. It is a civil right for all of us. I don’t know if AB will take a plea bargain or not. If I was in his shoes I sure would.