Here are some pictures taken during the 1995 Congress in Bratislava, Slovakia, and the 1997 Congress in Mogilev, Belarus.
 

Five young students play some Russian favourites. (1995, Bratislava)
Eugene Gladkov performs a duo on one tsymbaly, with his student (1997, Mogilev)
The "Litwins" group play Belarussian traditional music (1995, Bratislava)
Jenny Coxon (UK) learns how to hold a Belarussian hammer (1997, Mogilev)

The last night at the 1997 Congress, Mogilev. Everyone on stage to finish with a Belarussian folk tune (but I couldn't get them all on camera!).