Booz Allen Hamilton interview questions

Received a call to attend a hiring event after networking with a previous BAH associate. The interview event consisted of 50-some of us being interviewed by 10+ groups of people "speed interviewing" (15-30 minutes tops per session). It seemed that the people who came to interview you already received your resume long beforehand and decided they wanted to meet you and learn more about you; everyone I met seemed to already know my background without really looking at my resume. I've been to two of these events. They say they make decisions "that night" but I got offers from both events and each time it took a few days to come through. Just gotta be patient and follow up with them every so often.