Hi Giorgio,
Thanks for posting. At this time, The Events Calendar is not compatible with WPML, qTranslate, or any of the other multi-lingual plugins available- so it will only work in one language. However, we are planning to work on making it compatible with WPML this year, so that will be an option in the future.
I recommend that you add your vote to our UserVoice page for this feature. That way you can stay updated as we work on this, and you’ll be notified once we release a compatible version. Thank you for your interest and for your patience while we work on this!
Best,
Leah