What major event holds the decathlon?

Answer 1

The Olympics have a Decathlon every four years. After that, the World Championship of Athletics holds a Decathlon every 2 years on odd numbered years. There are numerous other Decathlons, perhaps the most prestigious international decathlon annually is the Hypo-Meeting in Gotzis, Austria.

Decathlon has also been used to name many other combined activities. The Academic Decathlon is such a test of for high school students.