I was quite lucky and only took me minimal Emilias to CR and SU my main one, she is currently a maxed unit in terms of CR and SU.

As for farming silvers, I wanted valks and healers at the start of this event and it has been giving me a few of them. I only realize now I am very low on rouges and I don't seem to be having much luck getting them...

This is my total farm so far:
Emilia x 10
Dorca x 4
Elanie x 3
Barrad x 1
Verotte x 1