As a retired attorney in PA I followed this pretty closely. Key to why the Carlisle shows happened, and other stuff didn't, Carlisle Events had the motivation and funds to litigate. I learned early on in law school, you get as much justice as you can afford. Not fair, but that's how the system works. I finally quit the game, after working for first the little guy, and later, a corporate employer, when my gag tolerance gave out.
The Commonwealth Court judge applied an equal protection test to the case, basically saying that the gathering at the car show fell under the same standard as the protests (which the governor had endorsed), and that the Health Department couldn't have it both ways. Confidential settlements are the norm in litigation, not something unusual. In my seven years as a general counsel, we had over 100 settlements, but never did a jury trial. The Health Department was on shaky legal ground, and was prudent to settle.
I have attended the Chrysler Nationals in Carlisle every year since it started in 1991. This year I was going to take a pass, and run my '69 GTX over the block at Mecum Harrisburg. I think it was meant to be that Mecum got cancelled and I went to Carlisle 30 years in a row. I was pleased to be able support the event, and was amazed how many Ford and Chevy guys came up to me and said we were all in this together trying to keep Carlisle going.