Events do work in single player, but in single player time passes differently. In SP time only moves forward if the player is actually playing, while in online play time moves independently of the player.
This means that if something would happen in 24 hours, in singleplayer the player has to actually play 24 hours to reach the timer.
An online player can log in next morning to check the thing, since the 24 hours pass even if the player is offline.
In practice this means that in singleplayer some rare events happen much less frequently. (the meteor shower being an important one)
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