From the month of January 2004, the GLUG Madurai meets regularly every second saturday at the TCE (Thiagarajar College of Engineering) Campus. These meetings usually comprise of technical talks and general discussions. The topics are quite varied and are not constrained to GNU/Linux.
There are no formalities required to attend these meetings i.e. you can just walk in and say "Hello.,". The agenda of these meetings will be posted on the website and on the mailing list atleast a week before the meeting.
Click here for the minutes of the past meetings.