Calista was in the building but Kyle had no knowledge of her presence, he couldn't have predicted something like this happening.
He thought she was so swamped with work that partying would be the last thing on her mind even though it would help to loosen her up from all the stress.
Calista came with a few friends but unlike Jane who told Kyle every single detail of her life, Calista maintained some sort of independence and only told him things that directly concerned him.
Even though she was more likely to tell him about this experience should anything of note take place.
Calista heard the music being played and found herself nodding her head in rhythm, she didn't come alone either.
A few of her friends were able to tag along, but she had to pay over-the-top money to get in even though she still had to stand in line.