It sounds a little complicated, but it is fairly easy to navigate. When you arrive at McCormick Place and park in LOT A, you will enter the complex via the West Hall. You will need to proceed to the NORTH HALL. To do this:
1. Head to the 2nd level and cross the bridge to the NORTH HALL
2. Once you cross the bridge, proceed down the escalator to the main lobby/concourse
3. At the bottom of the escalator, turn left to enter the main concourse
4. Walk to the stairs/escalator in the main concourse and head down the hall to the main show floor entrances
5. Once you see the giant globe then just look to your left past the auto show registration area (keep passing through it heading in). You should see the main stage area a little bit on the right as soon as you pass the registration booths. (You don’t need a ticket to this area)
Follow the map below from here on: