I'm going to assume that the party was Kliener Perkins, a venture capital firm. (Kliener is joo of course.) Maybe not, but that's the first logical choice I can find.
I'd also assume that it's like any other industry, when you reach certain levels you know (or know of) everyone in your "industry." Chances are Pao was at a level where the people attending were known to her, even if they weren't personal contacts.
Another aspect to consider is the service staff. They see much of what goes on.
I worked briefly as a waiter in a function center as a young man. One of the most outrageous functions I worked was a Bastille Day party for the French Embassy. I can tell you, these people party hard.
I used to attend some fan conventions, and there was always this unwritten "You guys leave the place a mess."
That was sort of true, but for the most part everyone respected the hotel because we wanted to come back next year. One of the conventions I attended, the hotel bid us a fond farewell and thank you. (parent corp abandoned it.)
Business conventions, on the other hand, always leave the hotel a mess. At least we weren't dragging in street hookers and cocaine. Don't even get me started on the military officer ones, they took any excuse to party hardy.
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