I will be visiting Marmomacc next week. Marmomacc is the biggest European stone fair, it takes place in Verona Italy, I have visited quite a few and this one is my favorite, you have a wide variety of Worldwide manufacturers. I will try to update myself regarding the market itself, hopefully I can share with you this information.
Nowadays it's actually very affordable to visit this fair and in general any other one, with low-cost airlines working most of the European countries. If you are also visiting, remember Marmomacc is a big fair, to see all the pavilions looking for opportunities you'll need 2 full days, and normally Thursday and Friday are the most popular visiting days.