From The Free On-line Dictionary of Computing (19 January 2023):
Linux User Group
LUG
<body, operating system> (LUG) Any organisation of Linux users
in a local area, university, etc., that offers mutual technical
support, companionship with people of similar interests and
promotes the use of Linux among computer users generally.
LUGs often hold Install Fests for the general public, in which
experienced Linux users explain and supervise the installation
of Linux on new users' systems.
(2003-09-14)