EXPO parking is in lines (nose to tail, but with space to move), therefore there will be 13 cars between your two vehicles.
I've parked there for the last few years and have found it to be a very practical location, however your chance of swapping will be reliant upon you actually 'meeting' one of your neighbours.
Which day do you intend actually parking up, as if its on Saturday I can give you a tip on access!