Welcome to Finland man. Kouvola has been legendary place for diabolo. So many good diabolo jugglers have come from Kouvola. Jussi and Toni are first to pop in my head but there are many oldschool guys as well. Also many new faces. Too bad most of them have moved elsewhere since that. But yes. There are diabolo jugglers in Kouvola.
I think you should contact the guys from this video:
GhostwriterOh remember to check out the scenery, that's Kouvola.
Of course there is the Finnish Diabolo Convention in Eräjärvi 6.-8.8.2010. But that's like month before you're coming.
Also if you're coming through or spending a day in Helsinki or Tampere we could try to organize a bigger diabolo meet for you. But for that i would need to know the exact date. The city would almost have to be Helsinki or Tampere to get many people there. There aren't many of us who would be able to travel to Kouvola on command. In Tampere or Helsinki it would be easy to gather like 10 people there. But that's something to think about for you.

I'm sure that we will find more people from Kouvola as well. Probably those two guys from Kouvola know more people from the area.