Random Events
There are several random events that can occur while the player sleeps. Listed below are all known random events that are not covered elsewhere.
Meteorite
There is a random chance that a meteor can fall from the sky onto The Farm at random tiles during night. A unique sound effect will be heard before daily earnings. In the morning, a message will pop up saying "An explosion was heard in the night..."
Meteorites do not despawn and require a Gold Pickaxe or better to mine. They drop 6 Iridium Ore, 6 Stone, and 2 Geodes.
The Crop Fairy
During random nights of the growing seasons, there is a chance for the Crop Fairy to appear before or after daily earnings. She will select an area that contains crops and transform them so they can be harvested. Everything from a 1x1, 4x6, to a 5x5 area has been reported. It has also been reported that she could revive crops after the end of their growing season when they are supposed to be dead. When the Crop Fairy affects crafted seasonal seeds, (Spring Seeds, Winter Seeds, etc.), the crops will only be of only one type (out of the 3 or 4 possible), chosen at random.
The Witch
In a random event after you sleep, a witch will fly over your Farm.
Coop
If she flies over one of your Coops, she will leave you with a Void Egg in the morning. This can occur on any coop size and capacity. Incubating the Void Egg will result in a Void Chicken.
Slime Hutch
If she flies over one of your Slime Hutches, she will turn all of the Slimes into Black Slimes. Placing a Wicked Statue in the Hutch will prevent this from occurring.
In late game you can unlock a path to her home through the questline Goblin Problem. She won't ever be inside to interact with, though.
Strange Capsule
There is a 1% chance for a test of your farm that decides whether or not a Strange Capsule will appear overnight overnight. To pass the test, 50 random tiles on your farm will be selected at random. Any tiles, even if they are not tillable, can be selected. If all 50 are clear, the test is passed, and the capsule will be spawned. If left alone, after 3 days it will appear broken, and its contents will have disappeared.