DO YOU REMEMBER HAVING TO AGREE TO THIS?
Current NASCAR
All the NASCAR event programs used to have a photo of Big Bill France and the disclaimer that "Racing is exciting & dangerous..... etc." and how neither NASCAR nor the track operator had any liability if you caught a wheel or worse a car in your lap during the race.
Of course, in a court of law, that disclaimer wasn't worth the glossy paper it was written on. As a car sponsor or event sponsor we always carried multiple millions of $$$ of liability insurance.
But, to answer your original question, Johnny, yes... I've signed many liability waivers at the back gate.