An exhibit hall is the area of a venue given over to exhibitor booths, where attendees walk the floor to meet vendors between sessions.
Hold the booths, move attendees past all of them, and keep people in it long enough for exhibitors to have conversations. The third is the hard one. Halls fail when attendees walk a loop, see nothing holding them, and leave for the coffee in the next room.
Put something attendees need inside the hall rather than outside it. Catering, the charging stations, a theater running short sessions, the networking lounge. Scheduling dedicated expo hours with nothing competing against them works better than hoping people wander in between sessions.
Booths near the entrance and on main aisles get materially more traffic than booths in back corners, and exhibitors know it. That is why premium placement is priced differently, and why a floor plan with dead zones produces renewal conversations you do not want. Design the aisles so there is a reason to reach the back wall.
The venue designer includes a booth tool for laying out and selling exhibitor booths, and exhibitors set up their own booth and manage it themselves rather than sending assets to the organizer. See exhibitors and sponsors.