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It was first introduced in the episode "The Duke." As its name alludes, it is a meeting involving all the rulers in Ooo. The purpose of the event is unknown, but Adam Muto described it as being like a G8 Summit. It is held in the Bad Lands at the Royal Congressional Hall.
- Wildberry Princess
- Emerald Princess
- Slime Princess
- Hot Dog Princess
- Raggedy Princess
- Lumpy Space King and Queen
- Marceline the Vampire Queen
- Princess Bubblegum