RFC's operate under the IETF. RFC's are developed under some specific group, and you can join that group, the business is generally conducted on email. There are (well, were back when I participated) in-person meetings, but attendance there was not mandatory.

RFC:s are published by the RFC Editor <https://www.rfc-editor.org/>. While it’s true that most RFC:s are written and published through the IETF, this is not an actual rule.