Thank you for sharing your question with the Wefugees Community!
How to marry in Italy was already discussed a couple of times on this platform. Please check, for example, either this thread or also this one for more information on required documents, the process etc.
As discussed here for the situation in Greece or here for Turkey, I assume that it will unfortunately also not be possible to marry in Italy if you are hiding yourself from authorities.
To get some more precise explanations you may also want to get in touch with legal advisors in Italy. Please see this website for contact details.
I hope this helps and all the best,