Here in California when the 4th of July rolls around conditions are always so dry that we have already had at least one major fire but that never stops anybody...I have never heard of a professional fireworks show starting a fire anywhere locally although a rocket went into a crowd and blew a girl's leg off in a nearby city some years ago. When working for the fire department I observed the preparation for a show and the fire department and the show operator were very meticulous and strict about safety at least here.
Fortunately for me, my grandparents live on a hill nearby a couple hundred yards away, where I can sit on the deck and watch, and when it is over, go back inside, or walk home which takes about 5 minutes.
Birken