Greet every participant as they arrive at your event. This makes the participants feel welcomed, also gives a sense of connection. Thus, this activity can be used as a passive ice-breaker.
And as the names keep rolling on the Big Screen, the participants may notice a familiar name or two. But even if not, the new names will have a familiar ring during networking, as they were already seen on the Big Screen. This way you can help your participants remember the names of their peers.