I think that was a joke. Judging from the rearview mirror video, the venue was pretty small. The event was also hosted by a graduate program at NYU, which in it's inception only had 20 members. While I'm sure NYC has a spare 100,000 people, I doubt such a high turnout for such a specific non-internet event.

It was definitely a joke.

Yeah anyone who missed that.. reading between the lines it looks like a pretty cosy event.