Regarding saying Vihi Noam on Motzei Shabbos Shabbos Hagadol which falls out a week before Pesach (The first night of Pesach is on Friday Night) [Luach Kollel Chabad](https://www.colelchabad.org/assets/pdfs/Nissan_English.pdf) writes:

> 
> On **Saturday night**, we do not say Vihi Noam and
>  V’Atah Kadosh.
> 
> 
> 

Why not? The whole week is a workweek (which is the normal condition for saying Vihi Noam).