I went to the Dulles, VA Legends Tour event in 2018 and my take away was, at that time, it wasn't really organized. The parking lot was packed with cars, many struggling to find somewhere to park. Lines for the giveaway car (at that time the green Datsun 510 wagon) and the vending machines were never ending and wound around without any sort of guidance, and ended up in the vehicle travel lane. I stayed for about 20 minutes and headed out.
I have to think things have improved. I'd love for it to come back around, if nothing else it provides casual afternoon of seeing really impressive cars.