At the conferences I went to it looked like most (80%) shuffled from one talk to another. The hallways were for walking to different talks. You could potentially talk in the queue to get in or out of a talk but no one talked to me at all.

There was a big space for vendors to have stalls but if you talked to them it was like talking to a sales person. Sometimes they had a tech-oriented sales person but it was still selling you their product.