| 1 | 1984 | Apr | Founded in Hampton, Virginia |
| 2 | 1985 | Feb | Orlando, Florida |
| 3 | 1986 | Mar | Las Vegas, Nevada |
| 4 | 1987 | Apr | Chicago, Illinois |
| 5 | 1988 | Sep | Annapolis, Maryland |
| 6 | 1990 | Mar | Orlando, Florida |
| 7 | 1990 | Oct | Yellowstone, Montana |
| 8 | 1990 | Mar | Brussels, Belgium |
| 9 | 1992 | May | Banaff, Alberta Canada |
| 10 | 1993 | Oct | Bar Harbor, Maine |
| 11 | 1995 | Apr | Flagstaff, Arizona |
| 12 | 1995 | Aug | Chicago, Illinois |
| 13 | 1995 | Sep | Irvine, California |
| 14 | 1996 | Apr | Washington, DC |
| 15 | 1996 | Oct | Cherokee, North Carolina |
| 16 | 1996 | Oct | Lusdorf, Switzerland |
| 17 | 1996 | Oct | Oxford, England |
| 18 | 1997 | Sep | Paris, France |
| 19 | 1998 | May | Moab, Utah |
| 20 | 1999 | Jun | Peyresq, France |
| 21 | 1999 | Oct | Quebec, Canada |
| 22 | 2000 | Mar | Las Vegas, Nevada |
| 23 | 2001 | Mar | Napa, California |
| 24 | 2001 | Oct | Boston, Massachusettes |
| 25 | 2002 | Mar | Orevieto, Italy |
| 26 | 2002 | Oct | Shepherdstown, West Virginia |
| 27 | 2004 | Apr | Monterey, California |
| 28 | 2005 | Apr | Bouldler, Colorado |
| 29 | 2005 | Oct | Springfield, Massachusettes |
| 30 | 2007 | Apr | Austin, Texas |
| 31 | 2008 | Jul | Peyresq, France |
| 32 | 2008 | Sep | Boulder, Colorado |
| 33 | 2009 | Oct | Albuquerque, New Mexico |
| 34 | 2010 | Apr | Tucson, Arizona |
| 35 | 2011 | Oct | Gatlinburg, Tennessee |
| 36 | 2013 | Apr | Everett, Washington |
| 37 | 2014 | Oct | Santa Fe, New Mexico |
| 38 | 2016 | Apr | Charleston, South Carolina |
| 39 | 2016 | Jul | Chalon-sur-Saone, France |
| 40 | 2017 | Oct | Chicago, Illinois |
| 41 | 2019 | Apr | Salem, Massachusetts |
| 42 | 2022 | Sep | Rochester, New York |
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