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Background
After triggering the task
Speak to the Assault Victim, you'll be able to talk to Klaasje on the roof of the
Whirling-in-Rags (#1). If you ask her a "personal question" about what you were doing on Sunday night (the night before the game started), and if you have Kim with you, then you'll trigger this task.
Walkthrough
Before you can get anywhere with Klaasje, Kim will remind you that you're in the middle of a murder investigation, and he'll refuse to allow you to continue your line of questioning. So to proceed in the task, you'll need to talk to Klaasje without Kim being around. The easiest way to do this is to return to Klaasje after Kim has gone to bed for the night. Klaasje will stay up until 23:00.
With Kim out of the way, Klaasje will tell you what she heard from your room on that fateful Sunday night: loud disco music (featuring Ostentatious Orchestrations), then a sad song ("The Smallest Church in Saint-Saenz"), then screaming and destruction (including the breaking of your window), and then silence (which Klaasje will assume meant you finally passed out). Learning this will complete the task and earn you 10 xp.
Note: If Kim isn't with you when you first ask Klaasje about Sunday night, then you won't trigger the task, but you'll still earn 5 xp at the end.
1 - Whirling-in-Rags