If you know that the signs are illegal and cannot be enforced, call and email. If and when that does not work, get together and carry. Again, if you know the signs are illegal.
In Ohio, we did this at numerous county fairs that were illegally posted, city parks, etc. The signs came down. Hell, in Fairborn, after a flood of emails, the signs were fixed in 24 hours. Court cases take too long and should be a last resort. Call the Transportation Director and the Governor. I have. I spoke directly with the director (he is an ass) and left a message for the governor.
In Oberlin, the ordinance was altered as a result of us gathering in large numbers in their parks. The change was not good enough, so we are suing. However, we have flat-out established that, regardless of what the ordinance now says, we can carry in Oberlin parks, and do so at will.
If you want an example of getting things DONE, quickly, effectively, and well, look to Ohio! We bring it on and git 'er done!