"a Boston coffee party"

The Boston Tea Party
Public DomainThe Boston Tea Party - Credit: Sarony & Major

A reference to the 1773 Boston Tea Party, when in protest to the high level of taxes imposed by Britain on subjects with no representation, colonialists threw bales of imported tea into Boston harbour.  This key event in American history was one of the causes of the War of Independence, leading to the formation of the United States.