Sure, novenas can be made anytime, but I thought that Fat Tuesday was the day in anticipation of Ash Wednesday.
It is, what does that have to do with the Feast of the Holy Face????
Our Lord to Sister Maria Pierina: (in part)
" I desire that It be honoured by a Special Feast on Tuesday in Quinquagesima (Shrove Tuesday - the Tuesday before Ash wednesday). The Feast will be
preceded by a Novena in which the faithful make Reparation with Me, uniting themselves in participating with Me in My sorrow."
Preceded means before, not including.