The hour has changed so it is dark early enough to have a bonfire and set off fireworks or to go to an organised event.
Compound Interest have some super posters and articles explaining the science behind not only the colours but also the sounds of fireworks.
this is a great poster - all you ever wanted to know
so now you know how a firework whistles!
I really recommend you visit the website because there are super articles to go with the posters.