FrOSCamp is a multilingual two-day event taking place on the premises of the ETH Zurich in September. It is completely free of charge and no preregistration for visitors is required. The event consists of an exhibition, talks, workshops and hackfests featuring free and open source software, free content, open standards, open systems and digital sustainability. People and projects are invited to demonstrate their work and to explain visitors said topics.
http://wiki.froscamp.org/Welcome