Grand Meeting of Ooo Royalty
"Princess Bubblegums" at the Grand Meeting of Ooo Royalty
Name	Grand Meeting of Ooo Royalty
Origin	Ooo
Type	Meeting
Holder	Royalty
Location	Royal Congressional Hall
Frequency	Sesquicentennial
Introduced In	"The Duke"

The Grand Meeting of Ooo Royalty is an sesquicentennial event in the Land of Ooo, meaning that it happens once every one hundred fifty years.

It was first introduced in the episode "The Duke." As its name alludes, it is a meeting involving all the rulers in Ooo, including Wildberry Princess, Emerald Princess, Slime Princess, Hotdog Princess, Raggedy Princess, Lumpy Space King and Queen and Marceline. 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.