SCRT (formerly called ISCT and before that SCT) is the first national trade association for carpet cleaners and restorers. It is still the largest trade association (by numbers of memebers) in the USA.
I think they have memebers in all 50 states, chapters in 7 or 8 states.
Lots of technical information from experts and those who have been in the industry a long time. (I was a contributor and the technical director and a memebr for 18 years).
The also have a scholarship program that will pay you back more than your dues toward educational events, IICRC schools, Connections and so forth.