Ross,
There were 400+ cars there, and luckily the Lotus group just managed to get a few spots. You had to get there before 8am in order get find a spot in the west parking lots. My car was the only pre '96 Lotus there, but there was a mid 80's to early 90's Caterham. It was a very diverse turn out, everything from the latest Lambos, Ferraris, and McLarens to rat rods. There was even a Porsche Carrera GT.
I saw the IG post, and though it was your car. A passenger in one of the Weissach Evora's was a co-owner of Checkered Flag and seemed to remember my dad buying an Elan Sprint and of course knew you and your dad.
In regards to signing up, it's more to do with letting the city and parks board now how many cars are expected so that Weissach can actually book the parking lot.
Are you going to make it to the ABFM this weekend?
Rod