"The rallys were held in many regions so Ford saved some money, I believe, by not placing a date or location on these generic dash plaques they sent out to dealers.
The programs, I think, ran at least into 69. Have some newsletters around somewhere."
Yes, Jeff's info is correct. These were Ford Factory sponsored events that were supposed to start and promote Early Mustang clubs back in the day, held around the country..(Promoted by your local Ford Dealers at the time.) Believe it of not, There is huge amount of video that was taken at these events that exists, and I have seen some of it about 15 years ago. I don't know who has all of the footage, but a Video could easily be produced.
Jeff is right, It died out in '69.
Tony K.