I don't much care for time restrictions for club nights either. I think they suck!
But I think the point that Evolution is trying to make, regardless of his opinion, is that the deadline was stated.
Its just another case of reading the small print, or not.
I agree, it's a piss take. But the T&C are there for a reason. And this case, rightly or wrongly, they cover the promoters' backs.
Don't forget the dynamics of how these events work: promoters with a reputation approach a venue saying they're going to put on artists x, y & z. The catch? They need 100% of the door to put the event on. What's in it for the venue? To take £££ bucks over the bar. The venue knows full well that certain events, while massively popular and likely to sell-out their venue, will not neccessarily drink that much. The solution? Force them to be in by a certain time to maximise their spend at the bar. Even if a punter is only buying bottled water, if they're inside for a good 6+ hours, then they're probably still going to spend at least £10 and therefore justify their attendance. Otherwise, it just really isn't worth it for the venue from a business point of view.