Hello - I was at this event last year (2018). It was one of the accepted student receptions. All of the early admits were given invites.
The event was held at the same place, and similar format. It began with a cocktail reception where alumni, students and parents mingled around for a bit. John Liew and Nondorf were at the entry door welcoming everyone in. Most of the alumni who were invited worked in the finance field in NYC. Two recent alumni were paired at each table, assigned seating. At the end of the meal, each of the alumni got up and introduced themselves. Most of them were in the finance field (investment banking, consulting, sales/trading, etc). About half-way through the introductions, Nondorf actually got up and joked that UChicago alumni have a wide variety of interests – not just finance.
Overall it was a well-done event. I had no idea that John Liew was a billionaire until I saw this article. He seemed very laid back and approachable to me. It definitely helped tip UChicago over the edge for me.