The Great Hunt
The Goblin King brings order to the Wilds, and he does it without a throne. The Great Hunt is his court, mounted and perpetually moving: it arrives, holds assizes, settles disputes, collects what it needs, and is gone before any army could be brought to bear on it.
Being on the Hunt's route is the closest thing the Outer Wilds have to citizenship.
Why It Moves
Partly because the Wilds have no single place worth ruling from, and partly — mostly — because a fixed capital could be besieged. The Queen's forces have never been able to bring the Goblin King to battle on ground of their choosing, and every attempt has ended with an expensive column standing in an empty campsite.
The Circuit
The route is not fixed and is not announced, though it is broadly known: the Bloodmoors for musters, the Rustlands for materiel, the Briar Barrens for remedies, the edges of the Nightwood but never its interior, and never the Hollow Marches at all.
Standing
Six of the nine goblin races have sworn. The pukwudgies have not, the boggarts have never been asked, and the hobgoblins are mostly in another world and have noticed that both crowns want the same thing from them.