Conversation so far:
When did the 21st edition of the Commonwealth Games start
The 2018 Commonwealth Games, officially known as the XXI Commonwealth Game were held on the Gold Coast, Queensland, Australia, between 4 and 15 April 2018.
When were the original first Commonwealth Games held
The Commonwealth Games event was first held in 1930, and has taken place every four years since then.
Has the event always been known by Commonwealth Games
Commonwealth Games called first the British Empire Games from 1930 to 1950, then British Empire and Commonwealth Games from 1954 to 1966, finally British Commonwealth Games from 1970 to 1974.

Question: How many countries have hosted the event
Self-contained rewrite: How many countries have hosted the Commonwealth Games