GNI The Gathering
I'd suggest starting with the GNI site itself: https://gaynaturists.org/the-gathering/
There lots of information available to answer a lot of questions you might have.
You should also check out GNI's other social media accounts: https://gaynaturists.org/social-media/
I'd recommend the videos on GNI's on Vimeo and YouTube channels.
There's also user groups on Facebook and MeWe. (There IS a group here on TN but not always active.)
If you've registered for this year's 35th anniversary you're now a GNI member and have access to GNI's members only site.
For those considering attending the Gatherings I'd suggest becoming a member for access to the members only site.
The members only site has various groups and also allows you to start connecting with other members.
(When I first joined, two years before my first Gathering, GNI only had snail mail newsletters. But it allowed be to learn about the organization and the Gatherings to become comfortable before I finally registered for the '99 Gathering.)
Hope this helps.