I've spoken to local plod and asked about the recent vehicular incidents and they said you could predict them no easier than all six numbers for the lottery. The bloke I was speaking to (an inspector) said people hire or nick cars miles away drive somewhere and do what they do in a random area, they have no connection to.
For the organisers to make a phone call within the timeframes we require (the ACF it's 2 months) and get an accurate assessment would be no more accurate than a definite weather forecast for December 12th made today.
It's like the nonsense just before BoB, RAFA asked the police and they said no problems and there weren't, but the police weren't at the parade, even though we had MPs and others there. The levels went to max and everyone got excited for 5 minutes, before getting back to their normal lives. My dad who is in his 90s smiles when these things happen and the news people get all excited, he says if we reacted like they do now during the war, we may have well just given up. If you stop or get over cautious we might as well not bother, imo.