this is a tricky problem that we've had with a few of the surrey meets.
all comes with posting up an event on the forum, basicly giving an open invite to any little scrotes and their crew to come along thinking that it's a mini cruise and a chance to prove something.
only real way we found to cut the problems is for the meet to be by invite/request only, obviously with the usual faces, but with the odd new face showing interest that dosn't act like a little ****** on the forum or a regular member can vouch for.
if your wanting to have a meet at B'water then why not have it down outside the police station and inform them of your intentions?