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Oh yes, that should be told to bastiaan, because on his website C. festivum doesn't occur in Italy! He should update soon! :D:D
But anyway Sarah, this isn't a question which species is depicted by your picture! It is quite sure to me this isn't C. festivum or C. vernale.
I'm quite sure this is another species, and the most likely candidate is Chrysotoxum intermedium!
I said there are some species in Italy I don't know, like cisalpinum and impressum, so maybe it is one of them. But from what I know, this should be Chrysotoxum intermedium!
Greetings