a proper P.A. system (sound system) is needed at these events in order to get any interaction with the crowd. i also work for a P.A. hire company called M.G. Audio and could help get this sorted out. The sound needs to be evenly spread out along the track and each stack properly time delayed, not just squawking out of the judges stand, even as far as down to the drivers who are queuing up, to let them know whats going on. Screens too, as mentioned by many could be sorted without any hassle by M.G. Audio. something to think about and look into, would make a huge difference to the atmosphere at the events. its as simple as, if people are having fun they will come back.