I will be studying in Italy for one year, and I already have my student visa. I arrive in September and I want to visit the Oktoberfest in Munich, Germany (just for one weekend) the same week that I arrive to Italy.
I know I have to get my codice fiscale and permesso di soggiorno in the first 8 working days after my arrival, and I'm wondering if I can leave and re-enter Italy before getting those papers, or if they are absolutely necessary for re-entering Italy.
If the student visa you already have is a uniform type D visa, then it allows you to make short visits to the other Schengen states.
I don't know whether leaving Italy is going to jeopardize any local Italian bureaucratic procedure that you've already started at that point, though. (And Expats would be a better place to ask that, anyway). I'd guess probably not -- the Italian authorities have little reason to even know that you go on a weekend trip to Germany.
But to play it safe, if you have 8 working days from your first arrival to file a local application, a possible strategy might be to file only after you get back from Munich.
