Boston and the Boston Police won't tolerate things getting as out of control as Charlottesville. They'll seal the area off, and more than likely keep the two groups as far apart as possible. A lot of very narrow streets, and a lot of historic buildings to be protected. Boston learned a lot after the Marathon bombing, and will put that to use.

ANTIFA is just an ultra left hate group with no real agenda. They oppose anything right wing, and destroy property, both private and public because it is there, and this they think is legitimate protest, as opposed to vandalism.