Hey Castle ... I admit that my memory is faded, but I don't remember ever being asked to sign anything. And then when I "checked kids in" as an older student, I don't remember anything then either. Again, there may have been something, but I don't recall signing it or it ever being brought up. I don't remember anyone ever referring to a contract of agreement.
As you know, my peer group recently got together - someone there actually brought the original admissions packet from the early 80s. I was amazed at what I read. THe charges that weren't included in the tuition, even just the basic "contract". It was wild.