Modding events
From EU3 Wiki
One of the easiest ways of modding EU3 is by changing or adding events. In the following we will look at a few starting pointers to this, for more about events visit the main article.
[edit] Removing or changing an event
All the exisiting events are scripted in plain text files in the events folder. All text files in this folder is read when starting a game, so don't leave anything there that might cause problems.
If you want to remove an event, you can delete it from the file it is placed in, or you can comment it out. You do this by placing hash signs (#) first on all lines. This can also be used to comment out parts of an event, like a event trigger or an event effect.
[edit] Adding a new event
The easiest way to do this is to place the event in a new text file in the events folder. That way the event will be added to the regular stock of events when you start the game. If you also play multiplayer, it is advised that you use the mod-switch utility in launcher, so that you can MP with an unmodified game.

