ALU
The Association of Lisp Users (ALU) is a Users Group which was set up to promote Lisp, help inform and educate Lisp users in general, and help represent Lisp users as a group to the vendors.

In recent years it has altered its constitution so that vendors may also be members, so perhaps the last of those objectives is not as relevant as it used to be.

Their web site is at http://www.alu.org/, which is admitted to look a little dated.

Topic: Community