Triangle National Meetings and Conventions
National Convention is the legislative body of the Fraternity in which undergraduate and alumni delegates, along with National Council, enact legislation and adopt positions on matters of national importance.
In 1973, Triangle returned to a former practice of biennial instead of annual legislative meetings. In non-Convention years, a National Meeting combined Leadership School with other sessions and workshops of interest to actives and alumni.
In 1988, the National Meeting became solely a Leadership School focused on undergraduate members. Leadership School includes the Awards Luncheon and Annual Banquet.
| December 9-11, 1909 | Champaign, Illinois | Convention |
| February 3-4, 1911 | West Lafayette, Indiana | Convention |
| February 2-3, 1912 | Columbus, Ohio | Convention |
| February 7-8, 1913 | Champaign, Illinois | Convention |
| February 27-28, 1914 | Madison, Wisconsin | Convention |
| February 26-27, 1915 | West Lafayette, Indiana | Convention |
| February 24-26, 1916 | Columbus, Ohio | Convention |
| February 22-24, 1917 | Champaign, Illinois | Convention |
| February 21-23, 1918 | Madison, Wisconsin | Convention |
| March 6-8, 1919 | West Lafayette, Indiana | Convention |
| February 26-28, 1920 | Columbus, Ohio | Convention |
| March 3-5, 1921 | Champaign, Illinois | Convention |
| May 4-6, 1922 | Madison, Wisconsin | Convention |
| May 3-5, 1923 | West Lafayette, Indiana | Convention |
| May 8-l0, 1924 | Lexington, Kentucky | Convention |
| April 30-May 2, 1925 | Cincinnati, Ohio | Convention |
| April 22-24, 1926 | Chicago, Illinois | Convention |
| April 28-30, 1927 | Chicago, Illinois | Convention |
| April 26-28, 1928 | Chicago, Illinois | Convention |
| April 25-27, 1929 | Chicago, Illinois | Convention |
| May 1-3, 1930 | Chicago, Illinois | Convention |
| April 30-May 2, 1931 | Chicago, Illinois | Convention |
| April 28-30, 1932 | Urbana, Illinois | Convention |
| April 27-29, 1933 | Chicago, Illinois | Convention |
| April 26-28, 1934 | Chicago, Illinois | Convention |
| April 25-27, 1935 | Chicago, Illinois | Convention |
| April 23-25, 1936 | Columbus, Ohio | Convention |
| August 30-September 3, 1937 | Rapid City, South Dakota | Convention |
| September 7-10, 1938 | Chicago, Illinois | Convention |
| September 6-9, 1939 | West Lafayette, Indiana | Convention |
| September 4-7, 1940 | Minneapolis, Minnesota | Convention |
| September 3-6, 1941 | Cincinnati, Ohio | Convention |
| 1942-1945 | Not held due to World War II | |
| October 25-27, 1946 | Chicago, Illinois | Convention |
| September 3-5, 1947 | Chicago, Illinois | Convention |
| September 2-5, 1948 | Madison, Wisconsin | Convention |
| September 1-3, 1949 | Louisville, Kentucky | Convention |
| August 30-September 2, 1950 | Brainerd, Minnesota | Convention |
| September 6-8, 1951 | Columbus, Ohio | Convention |
| September 10-13, 1952 | Chicago, Illinois | Convention |
| August 31-September 4, 1953 | Sylvan Lake, South Dakota | Convention |
| August 31-September 3, 1954 | St. Louis, Missouri | Convention |
| August 30-September 2, 1955 | University Park, Pennsylvania | Convention |
| August 28-31, 1957 | Urbana, Illinois | Convention |
| September 2-5, 1959 | Ithaca, New York | Convention |
| August 30-September 2, 1961 | Milwaukee, Wisconsin | Convention |
| August 26-29, 1963 | Excelsior Springs, Missouri | Convention |
| September 2-5, 1964 | Champaign, Illinois | Convention |
| November 25-28, 1965 | Cincinnati, Ohio | Convention |
| November 24-27, 1966 | Chicago, Illinois | Convention |
| November 24-26, 1967 | Minneapolis, Minnesota | Convention |
| November 29-December 1, 1968 | Columbus, Ohio | Convention |
| August 27-30, 1969 | Windsor, Ontario, Canada | Convention |
| September 2-5, 1970 | Boulder, Colorado | Convention |
| September 2-4, 1971 | Waukegan, Illinois | Convention |
| August 3-5, 1972 | Waukegan, Illinois | Convention |
| August 9-11, 1973 | Waukegan, Illinois | Convention |
| August 2, 1974 | Columbus, Ohio | National Meeting |
| August 14-16, 1975 | Rolla, Missouri | Convention |
| August 14, 1976 | Pittsburgh, Pennsylvania | National Meeting |
| August 18-20, 1977 | West Lafayette, Indiana | Convention |
| August 18-19, 1978 | Lawrence, Kansas | National Meeting |
| August 16-18, 1979 | Milwaukee, Wisconsin | Convention |
| August 15-16, 1980 | Toledo, Ohio | National Meeting |
| August 13-15, 1981 | Ann Arbor, Michigan | Convention |
| August 13-14, 1982 | Champaign, Illinois | National Meeting |
| August 11-13, 1983 | Cincinnati, Ohio | Convention |
| August 10-12, 1984 | Ames, Iowa | National Meeting |
| August 15-17, 1985 | Columbus, Ohio | Convention |
| August 14-16, 1986 | St. Louis, Missouri | National Meeting |
| August 13-15, 1987 | Milwaukee, Wisconsin | Convention |
| August 21-23, 1988 | Lincoln, Nebraska | Leadership School |
| August 20-23, 1989 | Ft. Collins, Colorado | Convention |
| August 12-14, 1990 | Cincinnati, Ohio | Leadership School |
| August 11-14, 1991 | Arlington, Virginia | Convention |
| August 8-11, 1992 | Rapid City, South Dakota | Leadership School |
| August 14-17, 1993 | Indianapolis, Indiana | Convention |
| August 6-9, 1994 | Madison, Wisconsin | Leadership School |
| August 5-8, 1995 | Overland Park, Kansas | Convention |
| August 3-6, 1996 | West Lafayette, Indiana | Leadership School |
| August 9-12, 1997 | Minneapolis, Minnesota | Convention |
| August 1-4, 1998 | Chicago, Illinois | Leadership School |
| August 7-10, 1999 | Orlando, Florida | Convention |
| August 5-8, 2000 | Ames, Iowa | Leadership School |
| August 3-6, 2001 | St. Louis, Missouri | Convention |
| August 8-11, 2002 | Brookston, Indiana | Leadership School |
| July 31-August 3, 2003 | Louisville, Kentucky | Convention |
| July 29-August 1, 2004 | Bloomington, Indiana | Leadership School |
| July 28-31, 2005 | Lisle, Illinois | Convention |
| July 27-29, 2006 | Champaign, Illinois | Leadership School |
| July 12-14, 2007 | Indianapolis, Indiana | Convention |
| June 26-29, 2008 | Terre Haute, Indiana | Leadership School |
| July 16-18, 2009 | Denver, Colorado | Convention |
| July 8-11, 2010 | Terre Haute, Indiana | Leadership School |
| July 14-16, 2011 | Columbus, Ohio | Convention |
| July 12-15, 2012 | Terre Haute, Indiana | Leadership School |
| July 25-28, 2013 | Irvine, California | Convention |
| July 10-13, 2014 | Terre Haute, Indiana | Leadership School |
| July 15-18, 2015 | Tysons Corner, Virginia | Convention |
| July 14-17, 2016 | Terre Haute, Indiana | Leadership School |
| July 19-22, 2017 | Litchfield Park, Arizona | Convention |
| July 26-29, 2018 | Terre Haute, Indiana | Leadership School |
| July 17-20, 2019 | Indianapolis, Indiana | Convention |
| July 23-26, 2020 | Indianapolis, Indiana - Canceled due to COVID-19 pandemic | Leadership School |
| June 26-27, 2021 | Virtual convention | Convention |
| July 7-9, 2022 | Orlando, Florida | Convention |
| July 27-30, 2023 | Dayton, Ohio | Leadership School |
| August 1-3, 2024 | Milwaukee, Wisconsin | Convention |