The Grazer Linux Days is a free event about IT-Security, Open
Source Software and Linux.
You can donate money or buy a t-shirt with the "Steirertux" to support the "Grazer Linuxtage - Verein zur Förderung freier Soft- und Hardware".
There are also exhibition stands from several companies who are related to open source software in Styria.
I visited the event together with Marin Oberkofler.