Top Gear, i appreciate your passion for the car shows and I am sure that you will do a great show.
Few suggestions from my side after viewing yesterday Race..
1- don't allow any cars other than which are for race or show, if there is no car then there would no mis management and at least no drag racing or drifting by the general public which unfortunately was visible yesterday; and would have turned into a major accident as few occassions.
2- Crowd control. It is a must, the best you can do is either have a wall, police, some ropes away from the strip so that people should not be allowed to come near. Make it necessary that no body should cross the strip in any circumstances.
3- Please don't allow in any circumstances the mobile phone walla movie makers and photographers to be near the cars, they just make the whole event a mess.
4- Have a proper place for media/photographers and ask them not to cross the strip again and again. Give them some proper places either on the strip, near endline or start line or in midline. It would be helpful for you to handle the stuff.
5- Make it a family event by having some sort of ticketing, make proper seating arrangements so that the view can't blocked, shades/tents can be used in order to avoid sunlight and heat.