hi, there is a lot of info on Internet.
me and a friend are traveling from Trieste, so i joined the Trieste group and posted some questions.
you should join the Zagreb group and ask around or join some people from the music festival group.

Here are the links
good luck


http://www.couchsurfing.org/group_read.html?gid=564&post=9818661

http://www.couchsurfing.org/group.html?gid=5186