The fact of the matter is, is that for busy high performing professionals their entire personal life is their professional life, but that doesn't mean that their entire professional life is their personal life. This seems to be a case of the former and that distinction was not made clear. Bolding the words "Official Party" make this an official company party. Were people from DFJ there, did they help put this together, were their busses. Yes. Did DFJ's LPs pay for the busses, booze, and catering? Unlikely. Overall I'm seeing an after-hours party of adults and friends. Don't like it? Don't go or leave early. It's sad that this guy had to dox Steve and that we're going in a puritanical direction, just because a small but vocal group of brittle spirits are so easily offended. There's a slippery slope here and while this is where you may draw the line, there's going to come a point where you're crossing someone's line.
Maybe if you're concerned about that, don't hold what is essentially a public party that will inevitably have a member of the press show up and cover it. You have to be pretty stupid to set up something like this and then get all whiny about it being exposed. If you want it private, then actually keep it private. There is no effort here to keep it private, if anything it's flaunted as if everyone else is the fool for not noticing the intentional exploitation that's going on routinely in the industry.
Edit: for what it's worth, there's also no consent possible when there's an external power dynamic at play.