I think you need to re-read your initial post, including the title. You start with the risk as a given. It's not just a matter of common sense, but established fact. I have no quarrel with your club or favor with the Classic, but just can't see how such a one-sided post is correct.
I just want to know if there is such a real risk. I may reconsider attending. I don't think it cuts it to say "Well a bunch of people think it causes skin disorders and is unsafe. So we are going to boycott it until they prove our unsubstantiated claims are wrong." I don't think your request for someone to say there is no problem is unreasonable, but that's not what you said in your initial post.
Do you really believe your comments about profit and running tournaments? I dare say that at your tourney, the lone men's room near the concession stand presents much more of a risk than the minimal left-over manure at the Coliseum. Have you seen the floor and seen what the boys step in and drag to the mat? Will you rent port-a-pottys for your tourney next year? How about getting rid of the raffle tables, the t-shirt table, or moving the concession stand to ceate less congestion? I am sure the panther and and its case right in the middle of the commons aren't going anywhere. Will you turn down the heat to prevent, in my mind, the greatly increased risk of transmitting the flu and colds. Maybe you could give up about 400 entries and use the smaller gym for your miscelleanous profit centers. If money and profit don't play a role, I guess making some signigicant changes to your tourney is an option.
I apologize for criticizing your club or its tournament. But until you stop ignoring your own profits and cut your entries to the number that actually fit your facility; pay for the rental of a bigger facility that fits the number of entries; or donate some of your money from some of your profit centers to the Classic, I think you should keep a tight grip on the stones in your glass house.