Attendees are paired with each person attending the session for two minutes.
You will want to use a timer and a bell, buzzer, or some kind of sound to notify participants when the two minutes is up, so they don't have to time keep on top of participating in introductions.
In a hotel conference room, you may have had the opportunity to set up pairs of chairs away from the training tables.
It gives people who are speed meeting a bit of privacy.
It's an efficient way for people who are interested in finding a special someone to meet a large number of people quickly in a safe environment.
Presumably, other attendees share similar goals and expectations when they decide to participate in speed dating activities.