They last raced there in 1966 when someone came in and cut in a half mile track using a portion of the mile track's front straightaway. Grandstands or part of them were eventaully condemmed. The fairgrounds eventually turned the infield into a giant softball complex in the 1970s or the 1980s, but like everything else in Detroit, it eventually failed. I was born and raised in Detroit, but you could not pay me enough to go back there now. Sad place.