Events are customizable pop-ups that appear in a game, the vanilla game itself doesn't have any events, however, it's relatively common in mods.
Notice: Events have several bugs and maybe don't even appear in the game depending on the trigger!
How events works
- Just one civilization can have that event (for more civilizations have the same event, you need to copy the event individually for every nation)
- An event triggers if a civilization has or achieved a determined thing (has X of technology, own province X, etc)
- After triggering the event, one or more decisions appears to be selected, decisions usually impact something later in the game