From a week ago on the press release thread on Facebook

"Fairbury American Legion Speedway Listen people. All parties were involved in the decision for canceling the race. There are a couple races that tracks scheduled that we did not see that are running the same weekend as us. Chances of rain had a little part of why we cancelled but we can’t take a chance on losing a lot of money like we did last year. Reserved seating and camping were down drastically from last year. I’m sorry that we came to this conclusion but it was a business decision by all parties involved not just FALS! Sorry!!!"

So it is exactly what prior posts said. Someone with FALS had a short circuit and everyone went along with it thinking they could blame weather and walk away without back lash and lost trust.