What day did guy Fawkes decide to blow up parliament?

Guy Fawkes and his co-conspirators planned to blow up the House of Lords on November 5, 1605, during the State Opening of Parliament. Their goal was to assassinate King James I and restore a Catholic monarch to the throne of England. The plot was discovered before it could be executed, leading to Fawkes' arrest. The event is commemorated annually in the UK as Guy Fawkes Night.