To an older generation of Brit – the ones who can’t bear Halloween because it’s “an American import”, who have no time for pound shop orange and spider-themed tat, and who won’t do trick or treat because its “glorified begging” – 5 November is “Guy Fawkes Night”.
Or Bonfire Night… or Fireworks Night. Whatever you call it, it’s far superior to 31 October in almost every respect.