The Activision Decathlon happened in 1983.
The Activision Decathlon was created on 1983-03-18.
Olympic Decathlon happened in 1981.
Intellectual Decathlon happened in 1984.
Activision Anthology happened in 2002.
Daley Thompson's Decathlon happened in 1984.
Bruce Jenner's World Class Decathlon happened in 1996.
When one is arranged as part of a games event or competition.
The correct spelling is decathlon.
Usually
The population of Activision is 4,000.
Activision was created in 1979.
A decathlon :)