Response to someone asking how to mod the Locations in Championships.txt file.
Once you have opened the championships.txt file, locate the locations part of the line of the championship you wish to edit (see image below)
It is then a simple case of adding extra locations, with each split with a ; making sure that the last one has a, after it.
Then save the file, and start a new game (making sure that the mod you have edited is activated, and the tutorial is turned off).
Thanks to shauneclifford3 for his great guide, all credit to his effort. you can also read the original guide from Steam Community. enjoy the game.