I believe the Palazzo Pitti in Florence has a Museo degli Argenti (Silver Museum) I am not certain what the display will be when you go and it might be worth your while to contact them.
The Uffizi in Florence also has a Silver Museum.
I think I have not explined my point.
I am interested in trade-fair or exhibiton where I can meet major manufacturers of International reputetion. I think you can suggest me a best place where I can meet and see work of these manufacturers.
I can give you info on an exhibition in London. It is called International Jewellery London. You can find it on the web. Maybe they will know of exhibitions in Italy.