Olivia's Ceremonial Magic Lesson.
There's a private library above the main library; once you purchase something from the Quartermaster (and it's at least day 14) he'll tell you about the room, and the girl that's staying there. She's got a couple of discussions about magic, and how she's being stopped from finding the truth. The final conversation is about her discovery of a book on Ceremonial Magic.
Next day when you go to the University, Katie will find you and mention that she helped someone get into the Ceremonial Magic chamber. To the rescue!
I don't remember seeing this in the public build. Is it in there yet or like Black Rose III still not? I think I could be done with v 4.11b then except for building up stats, money and the scene with Emily on day 75 or so.
Edit: Went back to day 17 I think and bought my first gem from quartermaster. Went o library and talked to Olivia. The next day when I went to Uni I didn't see Katie but but got a message that something was going on in DGN1 so I went in and rescued Molly from the Tentaku so even though Katie didn't tell me about getting someone into DGN1 I think I completed this event.