Hi again! I just found out about this while researching Geocaching. One of the caches I found mentioned Dravantura (an event at Drava in Croatia, featuring workshops on wilderness survival, building shelters, recognizing plants, making knots and arrows, diving, etc. -- at least that's what the cache text says it is), which you might be interested in, if you don't know about it already.
I noticed they have an event planned for September 5 this year, so you (and me too) might still make it.
Here's a link to the group's Facebook page:
https://www.facebook.com/groups/110114042355724/