Just out a name of a country that is on the list in for your details, and then put the correct address in the comments field. All orders are processed manually, so you are not doing anything wrong.
Oh thanks a lot for the advice! I'll go over and buy a ticket, then, and just HOPE the another show will happen!
(editing 5 minuets later... *head desk* They had Finland there but as Suomi in Finnish ... I never thought it would be there in Finnish so I that's why I couldn't find it ;-) )