Newby here:
I was flagged down by a Jag owner who told me a group of guys with Jaguars meet on first Tuesdays at a location. I showed up and they were talking cars. It took months to discover there was an official club (that didn't meet there) and, in fact, these guys were widely known, and in multiple local clubs.
I was there because I had just bought my first Jaguar, and was interested in learning about what was not documented in commonly available (company) publications.
I have been thrilled (and I think that's the first time I have used that word) with the acceptance, encouragement and the enjoyment they share. I still haven't been to an official club meeting. I joined because they DID things I enjoyed, like slaloming my daily commuter car.
With all due respect to those involved in the National bureaucracy, since I will never "show" my door dings or get the time to take a week to play with cars, the "club" is a very local organization.
Unlike SCCA or VSCDA.
Rick