How to unlock the four girls line up:
unlock the 3 memory
Janice and Georgia
Janice, Georgia and Mia.
Janice, Georgia and Dana
Day1
Talked to your sister in the morning so she can follow you during the demonstration
Make Janice save Dana by removing he truck and not save her
make a normal speech
Day2
Make your sister follow you and stay at the stage.
The police will come to arrest Dana and Mia.
Ignore them and escape.
(+1 fun)
EDIT: Sorry, i have the version 0.20.20. I don't have your version.
All i know, it's :
-Unlock Benson.
-Do a normal speech with Janice.
-Day 2 night (police station), Talk to Benson, tell her you want to help (speech 2), humiliate the girl. (For me, after "humiliate the girl" with Dana, Janice and Georgia, CAS will tell you a thing like : "More girl" and you tell her "Challence Accepted" . )
-Day 3 morning (police station). Talk to Benson.
The "4 line up girl" give you 1 fun.