Only room for 600

Want to attend Marc Prensky's talk on Day 1. Notice only room for 600. Expected attendance 1800? I hope there will be overflow rooms with closed-circuit TV, or perhaps he should he should talk online and we all sit in our hotel rooms and listen to him on our laptops. Perhaps the whole conference could be online and all participants could save a lot of money. But, of course, meeting and talking to real people has no substitute.