Five confirmed cases, how can you be sure that these five confirmed cases happened at the Classic. Is it possible that it happened in the practice room, in the High School practice room, middle school practice room, or even a previous tournament.
The incubation period for ring worm is 4-14 days. It makes it near to impossible to determine where it was contracted. If you had 5 confirmed cases concerning your wrestlers I would be more concerned about your practice room than the tournaments they are attending. A few facts from the Dept. of Health and Safety regarding ringworm.
Your risk of getting ringworm is higher if:
• You come in contact with a person who has a fungal infection or with a carrier—a person who has the fungi but does not have symptoms.
• You are susceptible to fungal infections or you have had a previous fungal infection.
• You have an impaired immune system due to a disease such as diabetes, AIDS, or cancer.
• You live in a warm, damp climate.
• You wear tight-fitting clothes or you let your skin stay damp for long periods, such as by staying in a wet bathing suit or sweaty workout clothes
You are a wrestler

Incubation Period For Ringworm
Tinea corporis: 4 - 10 days.

Tinea capitis: 10 - 14 days.

Ourkids are at risk to skin disease just because they are wrestlers. I am not convinced that you can prove that the kids from your club contracted a skin disease at the Classic. If other clubs also all of a sudden had an outbreak last year maybe I would be convinced, but so far that is not what is being reported.