We've been having 'Guy Fawkes night' as it's known here in NZ (bonfire night in the UK).
Why do we 'remember' Guy Fawkes and celebrate with fireworks? Because of the gun powder found under the Houses of Parliament. He was part of a group that wanted to blow up the Protestant King at the time (James 1) and replace him with a Catholic one. But the reason I think most people celebrate (apart from the fun of the fireworks) is that they like the fact that GF was trying to 'stick it to the man'!