I had never even heard of the commonwealth games until this thread.
The first games were held in 1930 and have been held every 4 years ever since, other than 1942 and 1946.
Initially called the British Empire Games and then the British Empire and Commonwealth Games, then the British Commonwealth Games and since 1978 simply the Commonwealth Games.
Venues have largely been within the developed countries although Jamaica hosted in 1966, Malaysia in 1998 and Delhi in 2010.
Canada has hosted 4 times but none since 1994. NZ has hosted 3 times but not since 1990 while the UK has hosted 7 (including this year's) and Australia 5 times and we will have them again next time after the Comm Games Committee begged Victoria to host them.
SA was a contender for the next games, which would have been the first time in Africa but the financing wasn't there.
Until 2010 The Queen always opened the games and the Duke of Edinburgh closed them, until he stood down from being Vice-Patron of the Commonwealth Games Federation, when that job was taken over by Edward. Charles opened the Delhi and Gold Coast Games as they were outside the UK. This was the first time he has opened the games in the UK. When the games have been in the UK there has always been a large royal turn-out, just as there was at the 2012 Olympics. The opening ceremony of these games was on the 10th anniversary of the opening of the Olympics in 2012. Anne and Tim were at a reception for remembering that event 10 years ago while Charles was opening these games.