I went to Information sessions at Harvard, Columbia and Wharton this past July. Plenty of open seats - they all averaged about 20-25 people. By my reckoning, a little more than half present were serious applicants, given the mandatory introduction we all had to do.
- Harvard was held in a section-sized classroom and was only about 1/3 full. I got the feeling that while most of the people there were serious, a few came for the free parking in Cambridge and a good campus tour. A quality but quick information session.
- Wharton's was quite good - held in a conference room in the admissions department. A Wharton grad and ADCOM member sat us down, and actually provided some keen insights to the process. The attendees were the most "professional", judging by their backgrounds, questions and dress. Only about 20 here - the room would not hold any more.
- Columbia was definitely the most crowded - and about 20 minutes into the presentation, a steady stream of about 25 (!) Chinese nationals streamed in at roughly two minute intervals, periodically interrupting the presentation and standing in the back. Mandatory tour stop, I guess. Even without that addition, there was at least 30 present, and they really ran the gamut of backgrounds - with 6 or so "starving bankers" by my count. The ADCOM presenter was excellent, and like all the others, they answered questions as long as people asked them after the presentation.
I definitely did NOT get the vibe that the place was buzzing with focused applicants in a standing-room only environment - far from it. Plenty of people in sandals and sunglasses who just got back from Quincy Market were on hand. Derive what you want from my account, but if I had a nickel from every guy I saw show up with their grubby Euro-trip Backback and unironed clothes, I'd have at least 40 cents.