Bottom line, you will need the permit. I'm surprised at the number being 75 since the DNR listing is 20 people. I'm not gonna dig for it on my computer but trust me, I can produce it.
This is one of the reasons GLFWDA promotes runs thru it's membership. We already have the insurance. But, everyone attending MUST be a GLFWDA member. This is not our rule, it's the insurance companies.