180 BBY

Tatooine's new orbital mining station, Tatoo III, is destroyed when it collides with a transport. It is discovered that anything created using ore from the planet becomes magnetic due to the planet's twin suns. Discovering it too expensive to counteract this, the planet is abandoned as a mining colony. The original colonists remain, but Tatooine's prosperity comes to an end.
Galaxy Guide 7: Mos Eisley, via Time Tales.
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158 BBY
Orn Belden is born on Bakura.
Truce at Bakura Sourcebook, via Time Tales.
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153 BBY
Chalmun -- future owner of the Mos Eisley Cantina -- is born on Kashyyyk.
Galaxy Guide 7: Mos Eisley, via Time Tales.
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150 BBY
Chewbacca leaves Kashyyyk to explore the galaxy.
The Essential Guide to Characters.
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Bakura is discovered and exploited by the Bakur Corporation.
Truce at Bakura Sourcebook, via Time Tales.
 
 
 
145 BBY
110 BrS:3:18
The Third General Survey begins to explore the galaxy's spiral arms.
Holonet News #52.
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140 BBY
A shower of asteroids hits the Qella's homeworld, wiping out the entire race.
Before The Storm, via Time Tales.
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132 BBY
Republic explorers discover the planet Orax.
Star Wars Adventure Journal #15: "Alien Encounters", via Time Tales.
 
 
 
130 BBY
A group of Jedi form the breakaway sect known as the Potentium, believing that the dark side does not exist, and that Jedi should follow the will of the Force and not the rules laid down by the Jedi Council. They are eventually expelled from the Order.
The New Essential Chronology.
 
 
Jorus C'Boath (future Jedi Master) is born on Bortras in the Reithcas sector.
Dark Force Rising.
 
 
The garbage pits of Coruscant inspire someone into creating a lethal new type of sport – garbage pit racing. The sport involves gliding down a garbage pit, while avoiding a fatal run-in with garbage canisters being expelled into space.
Rogue Planet, via Time Tales.
 
 
 
129 BBY
The small, ancient world of Langhesa is overrun by Tsinimals. The Langhesi who avoid becoming slaves migrate all over the galaxy, becoming artists and farmers.

Several rejected Jedi candidates band together and try to form their own sect of the Jedi, the Potentium. The candidates are mostly aristocratic children from Alderaan and Coruscant.
Rogue Planet, via Time Tales.
 
 
 
128 BBY
Eppie Antruse (Belden) is born.
Truce at Bakura.
 
 
 
124 BBY
The Wol Cabasshite Jedi Master Omo Bouri orchestrates the Treaty of Trammis.
Starwars.com Databank; The New Essential Chronology.
 
 
 
120 BBY
The Ugnaught named Ugloste is born on Gentes. He will later be in charge of Cloud City's carbon freezing chamber.
Star Wars Special Edition Sourcebook, via Time Tales.
 
 
 
112 BBY
Much of the structural framework of the droid that will become C-3PO is built by Cybot Galactica.
A Guide to the Star Wars Universe; Episode I - The Visual Distionary. West End Games'  background suggested C-3PO was this old, but we later see C-3PO built in Episode I. This background was altered by The Visual Dictionary to allow for both stories.