I did attend an INSEAD info session in my city way back in 2008. The info session was hosted by INSEAD's Marketing Director and there were 6-7 Alumni who shared their experiences at INSEAD. I vaguely recall that the agenda included information on the MBA curriculum, Admissions Criteria, Student Life and Social Scene at INSEAD, and Career Opportunities.
Then the Alumni introduced themselves and this was followed by a Q&A session where we could pose Questions to the Alumni and Marketing Director. The 20 mins Q&A session was followed by a Cocktail event and the audience was able to mingle more closely with the Alumni. The Alumni were very smart people but also down to earth and seemed fun to work with. They stressed that INSEAD was an intense life-transforming experience for them and it was the best decision they ever made. They only wished that the program was longer than 10 months.