The bar staff at the Sam Adams brewery in Boston have seen busy weekends. They had not seen anything like the Tartan Army. Over four days in June, kilted Scotland supporters drank the place through seventy kegs of America’s most patriotic lager, sang until their voices frayed, and turned a craft brewery taproom into a slice of Glasgow with better weather. … The numbers from Boston read like a tall tale. Seventy kegs of Sam Adams emptied in four days at the brewery alone, never mind the bars across the city that filled with tartan from morning until well past...