Do they really turn you away if your miss your slot time? Or is it more of a case of "do your best to be here around that time"?
I've only ever been to one event that I needed a slot time for, and was there on time. Having said that, many arrived well after the last official slot time, and were happilly accepted.
So, has anyone ever actually been turned away for missing a slot time? Exclude for this events where you are told there is a display comencing at 12:30pm, and you must be on the ground befor 12:00pm, and you actually turn up at 1pm.