Yodel Conference 10 was to be held at Gyproc in Varberg, Sweden. A text file (in Swedish) inviting people to the event mentioned there would be competitions for Demo/Intro (pc/amiga/c64), 4- and multi-channel music, and pixeled/rendered graphics. However, as far as we can tell, no results (or files) are available from the event. It may have been held as a pure lan party, and the competitions cancelled, or it may not have been held at all.
From yodel.net; "Yodel Conference 10 Was held between 23 - 26 July 1998 at Gyproc. The number of visitors were around 50 people. Our sponsors was Consensus for the demo compo and Campino for food supply. We also introduced our new party system, Yodel Party Administrator System (Y.P.A.S). Written in Java and Perl and runned through a standard browser. The system can handle pizza and cola orderering and also all voting."