Thanks for the correction Blue_, I didn't realize that a date had already been set. I find it interesting that they are getting married in Italy and not in Belgium. But then again, I remember reading that Lili was born in Rome, so perhaps that's why.
I think most of the wedding happens in the city/country of the bride. Felix of Luxemburg, Imre and Christoph Habsburg, ect. did it too. I did not expect them to marry in Brussels. Rome or even New York was more logical. Rumors says they'll move to Belgium after their wedding, if it's true it's a reason more for them to marry in Rome