Bonfire Night, commonly called Guy Fawkes Night, is observed on November 5th each year in the United Kingdom. It commemorates the failure of the Gunpowder Plot of 1605, when a group of conspirators attempted to blow up the House of Lords and kill King James I, and it is traditionally marked with bonfires, fireworks, and, in some places, local events or parades. Key points:

• Date: November 5 every year. In practice, many communities schedule events on nearby days (especially the weekend) if November 5 falls on a weekday.
• Origin: Began as a national day of thanksgiving for the plot’s failure, with fires lit to celebrate the king's survival [Guy Fawkes Night].
• Common customs: Bonfires, fireworks displays, sparklers, toffee apples, and sometimes effigies of Guy Fawkes are part of the celebrations in various towns and neighborhoods.

If you’d like, I can tailor this to a specific country or region (e.g., England, Scotland, Wales) or provide punctual details about local celebrations for the current year.