The current weather forecast calls for "Heavy/Moderate" rain ( 100% Late Saturday night through early Sunday morning) . Question is whether it will clear before the event starts and the lead time to get there (?).
I spoke with the event organizer yesterday . He understands everyone concerns, and wouldn't expect many to show up if it's raining. So, if you want to take the chance or some rain doesn't concern you , you might have some company there in the morning. Depending on the turn-out ( specifically, the lack of), he would consider selecting another day for the FGT/Shelby Super Car Sunday later this year.
Although not looking too good now from where I'm at , I'm going to see what it looks like later tonight before making the decision.