Never been to one to be honest. Apart from the need to travel to one, I’d much prefer to visit a dealer once I know a vehicle has made it to the scheme. Less hussle and bustle than these events!
Went to the Birmingham one since it was only an hour away, you’re certainly better of spending the day going around a few dealerships to look at some cars. At the event you’ll be basically fighting other people to have a sit in a car.
So much this. But free pen
So much this. But free pen 
Use to go the Electrical, Fire & security events. Loads of free goodies from USB sticks designed in appropite shapes, notbooks, pens, fluffy’s, along with samples of the goods. It was mayhem then, with the number of folk waking around. I can’t see the point of going with everyone scramming to sit in a car and wait hours for a test drive.