This is the first Face-To-Face meeting of the Phase C internal to the Consortium. The meeting is held in presence, in Milano, at INAF - Astronomical Observatory of Brera premises, from Wednesday 10 May to Friday 12 May 2023. It is possible to follow the meeting remotely. Aim of the meeting is to finalize the documentation in view of the Long Lead Item review foreseen for the first week of July and to make an overview of the status of all the CUBES Work Packages.