A Go club is a place where Go players meet.
There are online Go clubs on several Go servers. Generally, we refer to a club when people meet in real life. The following pages describe different aspects of a Go club.
Places with and without clubs:
The Dutch have a manual for clubs (in Dutch):
Handboek voor Clubs / Pers en publiciteit
The American Go Association offers some "how to start a club" articles: http://www.usgo.org/resources/startclub.asp.
The Traditional Baduk Association?
offers Baduk server and many other services: