My father was Raymond Lawrence Maness and he did move our family to Chicago in the early 50's. he died there on Nov 29th 1960 of a heart attack. He was 50 years old and I was 10 at the time of his death. His mother was Lula Zills. I have never been to the Oak Grove event but would like to! All the names you mentioned sound familiar from my childhood and youth. Thanks for the info. Keep me informed!
Jack B Maness