I suppose you could have members only, like the social club in Partington (or Luton Town in the 80's), although obviously I hope it wouldn't come to that. On occasions like Tuesday night though, it's very difficult to legislate for everything. I seem to remember a bit of aggro when Colwyn Bay decided to let in juveniles for free. And then there was that lad from Stockport (I think) a few years back who just liked streaking. It seems a bit unfair to hold football clubs responsible for society's problems. Short of taking robust action when such incidents do occur - as the club have done - I don't know that there's much more that can be done if someone the club knows nothing about just decides to turn up on the day.