I "accidentally" took a wrong turn on the way back from a meeting and somehow ended up at the parade. The Globe estimated a million people, or about one-third of those who attended Trump's Inauguration, would be there, and I'm pretty sure that they were all packed into Government Center. It was cold, sleeting and packed about 30-deep (People were already 2-deep at 8am for a parade that came by at noon.), but people were generally friendly.
Funny story: Nobody's cell phone was working because there were too many people were jammed together, so we had no idea where the parade was or when it would reach us. The people in the seven-story office building across the street must have figured that out, because they began putting signs in the windows that kept us updated on where the Duck Boats were.
Mike