The Peacekeepers mega event is an incedibly fustrating one. I decided to do what no one has gone before, making a custom race based on the Peacekeeper and i used cheat codes to help me get the through it,  for the galaxy set up i chose the following:

Galaxy size: gigantic

Victory condition: Conquest

Anomalies: common

Number of asteroids: rare

Numbr of planets: Abundent

Number of habital planets: Abundent

Number minor races: 0

Star clusters: Loose

Blind exploraton: On

Allow surrenders: Off

Now for the Peacekeepers to be created. I used the Dark Yor race portrait and the Altarian Ressetance logo. I used the Drath Ship style just like when the PKs usually appear to use.

For the oppenents i chosed the Drengin Empire, the difficulty: begginer.

when the game started, i quickly used the research all techs cheat, i aligned my self with good. Began to make massive fleets of Dreadnoughts, now it was time for me to look for the Drengin, when i found them i instanly declared war on them, i surrounded  there planet, attacking their warships, i let there civilian ships leave the sector. While i was distracted attacking their warships, on of my planets was invaded, i used a cheat to reval the entire map. I soon discovered that they had colonized a planet so that they use a counter strike. I knew that this was trouble, bcause i coudent ivaded any of their planets.

So in the end i was defeated, but i learned what the Peacekeepers' weaknesses were that they only attack warships and they don't invade planets.

If this helped please post a response! NOTE: this was done with DA