The first ever BarCamp in Rotterdam is tonight.

The topic, Open Source media, encompasses a lot: open source media
technologies from web design with free content management systems to
audio and video editing on Linux, broadcasting with free software, but
also: open content and open source media activism, music and arts;
whatever is an artistic, technological and philosophical alternative
to proprietary media technology and distribution. If you are working
in this field, please come and tell something about it. WORM and Piet
Zwart people, for example, plan to speak about video editing with
Cinelerra and open source audio/video streaming.

More details at BarCamp Rotterdam Website