Triennial Convention was created in 1814.
Echigo-Tsumari Art Triennial was created in 2003.
we should have celebrated the triennial anniversary of our runnig race at our high school.
The triennial festival was coming to town this year, as it did three years ago.
It is a triennial event. A triennial event happens three times a year.
Centennial
triennial
Sleep Convention was created in 1982.
National Convention was created in 1792.
ConFusion - convention - was created in 1974.
Third Convention was created in 1936.
Boskone - convention - was created in 1941.
Conflux - convention - was created in 2004.