PGI started it all back in '69. It has a 32-page Bulletin issued four times a year, and it has that great international convention each year. Besides PGI, there are local clubs in many states. Some of the clubs have open membership and encourage new members all the time. Some have closed membership and only accept new members when an old one drops out.
Information is a very vital part of fireworks.
We are learning all the time and you never have enough information when you are dealing with fireworks. Following is a list of basic books for hobbyists, and a list of suppliers, and some other information. One of your best purchases would be a copy each year of the annual North American Fireworks Trade Directory . AFN sells it - see our catalog . This is one of the basic books that all of us use.