the.com/bonfire night

means An annual UK commemoration (5 November) marked by fireworks and bonfires, often topped with a 'guy' effigy, recalling the foiled Gunpowder Plot of 1605.

from 'Bonfire' itself likely comes from 'bone fire' — medieval fires built from bones of slaughtered animals or, grimly, the remains of executed heretics and plague victims, later softened into the generic word for any large outdoor blaze. 'Bonfire Night' as a name attaches to 5 November because Londoners lit celebratory fires the very night Guy Fawkes's plot to blow up Parliament was discovered in 1605; Parliament soon made public thanksgiving (and burning) an annual observance, which over centuries drifted from solemn relief into the fireworks-and-effigy tradition kept today.