Id say that that will all work out fine. And as far as better procedures go i dont think that there are any. If a non-security person tries to usher them out they might get beligerant and cause an even bigger disturbance. Also you cant come to blows in any way shape or form or they can sue the asses off everyone in charge. As long as the security are experienced and dont mess up themselves then things should work out fine if such a problem arises. though it is doubtful at such an event.
The only possible time id suspect any such behaviour would be at some of the later events in the day which would invariably become 18s only anyway which would mean that they are subject to the same public order laws as the security and the security then would have some lee-way in getting rid of the troublemakers.
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