This is what we know:
1. JY's event is in Sanlitun (a popular entertainment place in Beijing, full of bars, clubs, KTVs, fancy restaurants, etc.)
2. ZZ's manager showed up together with JY in the same event
3. JY only stayed for a very short time in the event (about 7:00-7:30 pm)
4. During JY's previous visits in BJ, he was seen in Sanlitun twice. ZZ was also seen in Sanlitun once (so seems both of them like this place)