Cut the grass in your parking lots as short as you are able. And remember that you have not eliminated the potential for problems if you don’t also remove the mowed grass and brush. Catalytic converters located on the underside of most vehicles stay hot for some time after the drivers have left their vehicles. On more than one occasion, these catalytic converters have caused a grass fire in the parking lot area and caused an entirely different type of parking problem.
Learn the easy way from the lessons learned the hard way by others. Save yourself the expense, embarrassment and misery of yet another Car-B-Que on your show grounds. Mow the grass. Remove the grass clippings and light brush. This is an avoidable problem, but you need to be pro-active to keep it from happening to you.