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| Year | Dates | Location | # | Chairman |
| 1999 | August 18 - 21 | Chicago (Sheraton) | 75th | Hugh Dunbar, DTM, PDG |
| 1987 | August 24 - 29 | Chicago (Hyatt Regency) | 56th | Lou Kiriazis, DTM &
J. K. Nath Nayak, DTM |
| 1972 | August 2 - 5 | Chicago (Sheraton) | 41st | Lou Kiriazis, DTM |
| 1952 | Chicago | 21st | ||
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| Year | Dates | Location | Chairman |
| 2003 | June 19 - 21 | Arlington Heights (Sheraton) | Alvin Joyner, DTM, PDG |
| 1995 | June 16 - 17 | Oak Brook (Lodge) | Keith Essex, DTM, PDG |
| 1989 | June 1 - 3 | Deerfield (Hyatt) | Jerry Boehm |
| 1982 | June 10 - 12 | Chicago (O'Hare Howard Johnson) | Henry Sharton, DTM |
| 1976 | June 24 - 26 | Schiller Park (Howard Johnson) | Milt Laften |
| 1970 | June 19 - 20 | Chicago (Lake Tower Inn) | Beverly Chase |
| 1964 | Chicago (O'Hare Inn) | ||
"Thanks!" to Keith Essex, DTM, PDG, who provided the history.