2001, Spurgefest II, Leafy Spurge Symposium: Medora, North Dakota; June 19-21

1999, 20th Anniversary Leafy Spurge Symposium: Medora, North Dakota; June 29

(1998: none held)

1997 Leafy Spurge Symposium: Gillette, Wyoming; July 7-9

1996 Leafy Spurge Symposium: Brandon, Manitoba; August 13-15

1995 Leafy Spurge Symposium: Fargo, North Dakota; July 25-27

1994 Leafy Spurge Symposium: Bozeman, Montana; July 26-29