Jo, it's definitely the VX XV anniversary in the US, but I don't think that there were VX's at ZuZoo the first year that they were available, but I could be totally wrong on that. A few years ago Todd Adams handed out some stickers that said what year it was for the VX meet (the year we all met up at his RV in the campground). I have the sticker at home and I'll have to look at it to see what it says to determine what year this is for the VX meet.
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong, it usually turns out to be impossible to get at or repair."
-Douglas Adams, Mostly Harmless