DON'T OVER-THINK THIS !

Elements to Incorporate:
Acceptance by Invitation only --
It is the host who invites, though anyone can enter into the Dance. Only by invitation is one afforded the privileges offered by the host.

List of privileges --
Clothed: Clothing worn in and out of the Hall. The uninvited must leave their garments at the Hall.

Housed: The invited alone are allowed housing.
There are rooms within the Grand Hall -- none are sure how many. They are offered only to those who accept the Host's invitation. A new home in the Hall is one thing, but work outside, in the world, is still necessary.

Fed: All are fed but only the invited are allowed access to the Fountain at the Hall's center.
Only the invited are welcome to the "full spread" whereas guests are denied the fountain at the center of the sea of dancers...