Is there any official (other than any ANSI standard site) or quasi-official or unofficial main site for Lisp or Common Lisp?
I had seen a couple of other sites which seemed like they might be that earlier, like https://common-lisp.net/ and the site of the Association of Lisp Users, which I vaguely remember as being at http://alu.org , but now a Google search shows some other sites instead (from the first few hits I looked at). And now there is this one mentioned in the OP. I looked at its About page, http://lisp-lang.org/about/ , but it does not seem to show any such info.
Update: I saw this on the common-lisp.net site:
"This site is one among many gateways to Common Lisp."
which seems to indicate that there was/is no single "(un)official" one.