- ALCON 2022, Albuquerque, NM from 28 to 30 July 2022
- ALCon 2021 – Alcon Virtual
- ALCon 2020 – Cancelled due to COVID
- ALCon 2019, Kennedy Space Center, FL and 3-day Royal Caribbean cruise to the Bahamas
- ALCon 2018, Minneapolis/St. Paul, Minnesota July 11-14, 2018
- ASTROCON 2017, Casper, WY Aug 16-19 2017
- ALCon 2016, Washington, DC
- ALCon 2015, Las Cruces, NM
- ALCON 2014, San Antonio, TX
- ALCon 2013, Atlanta, GA
- ALCon 2012, Chicago, IL
- ALCon 2011, Bryce Canyon National Park, Utah
- ALCon 2010, Tuscon, Arizona
- ALCon 2009, Long Island, New York
- ALCon 2008, Des Moines, Iowa
- ALCon 2007, Portland, Oregon
- ALCon 2006, Arlington, Texas
- ALCon 2005 Kansas City, Missouri PDF PDF
- ALCon 2004, Berkeley California
- ALCon 2003, Nashville, Tennessee
- ALCon 2002, Salt Lake City, Utah
- ALCon 2001, Frederick, MD
- ALCon 2000, Ventura, CA
- ALCon 1999, Spokane, WA
- ALCon 1998, French Lick Springs, IN
- ALCon 1997, Copper Mountain, CO
- ALCon 1996, Rockford, IL
- ALCon 1995, San Antonio, TX
- ALCon 1994, Kansas City, MO
- ALCon 1993, Madison, WI
- ALCon 1992, San Jose, CA
- ALCon 1991, Amherst, MA
- ALCon 1990, St. Louis, MO
- ALCon 1989, Spokane, WA
- ALCon 1988, Council Bluffs, IA
- ALCon 1987, Pomona, CA
- ALCon 1986, Baltimore, MD
- ALCon 1985, Tucson, AZ
- ALCon 1984, Milwaukee, WI
- ALCon 1983, Jacksonville, FL
- ALCon 1982, Peoria, IL
- ALCon 1981, Kutztown, PA
- ALCon 1980, Dallas, TX
- ALCon 1979, Portland, OR
- ALCon 1978, Madison, WI
- ALCon 1977, Boulder, CO
- ALCon 1976, Kutztown, PA
- ALCon 1975, Atlanta, GA
- ALCon 1974, East Lansing, MI
- ALCon 1973, Omaha, NE
- ALCon 1972, Seattle, WA
- ALCon 1971, Memphis, TN
- ALCon 1970, Pittsford, NY
- ALCon 1969, Denver, CO
- ALCon 1968, Chicago, IL
- ALCon 1967, Washington, DC
- ALCon 1966, Miami, FL
- ALCon 1965, Milwaukee, WI
- ALCon 1964, Denver, CO
- ALCon 1963, Orono, ME
- ALCon 1962, Albuquerque, NM
- ALCon 1961, Detroit, MI
- ALCon 1960, Haverford, PA
- ALCon 1959, Denver, CO
- ALCon 1958, Ithaca, NY
- ALCon 1957, Kansas City, MO
- ALCon 1956, Miami, FL
- ALCon 1955, Seattle, WA
- ALCon 1954, Madison, WI
- ALCon 1953, Washington, DC
- ALCon 1952, Dallas, TX
- ALCon 1951, Chapel Hill, NC
- ALCon 1950, Wellesley, MA
- ALCon 1949, Cleveland, OH
- ALCon 1948, Milwaukee, WI
- ALCon 1947, Philadelphia, PA
- ALCon 1946, Bloomfield Hills, MI
- 1945 (None held due to WW II)
- 1944 (None held due to WW II)
- 1943 (None held due to WW II)
- 1942 (None held due to WW II)
- ALCon 1941, Washington, DC
- ALCon 1940, Pittsburgh, PA
- ALCon 1939, New York, NY