Evacuation is something that happens on "the best seat in the house" as an old advertisement put it. I think the name of the company was, of all things, Church.
My encyclopedia does not even mention Evacuation Day. It must have been weeks after the battle at Breed's Hill. Again the encyclopedia gives no clue. I can't remember dates and revisions revulse me. But when I was small, I could tell someone to "Go to Halifax!" when it was forbidden to say "Go to hell!"