Final answer:
The Gunpowder Plot and the tradition of Bonfire Night
Step-by-step explanation:
The important event that happened during James VI of Scotland's reign that we still celebrate today is c) The Gunpowder Plot and the tradition of Bonfire Night.
The Gunpowder Plot occurred in 1605 when a group of conspirators, led by Guy Fawkes, tried to blow up the English Parliament building in an attempt to assassinate King James I. However, the plot was foiled and Fawkes was arrested. To commemorate the failed assassination, Bonfire Night is celebrated on November 5th every year in the United Kingdom with fireworks, bonfires, and the burning of an effigy of Guy Fawkes.