in England, a day (Nov. 5) commemorating the foiling of the Gunpowder Plot: celebrated with fireworks, guys, etc.
See Guy Fawkes Day in American Heritage Dictionary 4
(gi' fôks')
noun
November 5, observed in England and parts of the Commonwealth to commemorate the foiling of the attempt led by Guy Fawkes in 1605 to blow up the king and members of Parliament in retaliation for increasing repression of Roman Catholics in England.