I think the workshops are free entrance, but I don't want to say something stupid
For workshops in zurich, I don't know... There was the tweak festival in Technopark, there were some workshop there http://www.tweakfest.ch/
There is also a share node in zurich (http://www.share.dj
) They usually do it on sundays but not every sundays, and I don't know how to get their mailing list...