THE PILTDOWN ROOM, located in the Finch Wing of the Darwintern's Head Office in the Galapagos Islands, is said to be the principle meeting chamber for the League of Overseers. 

Piltdown Room, Darwintern HQ, Galapagos Islands

It is presumed the Piltdown Room is the venue for the Conclave of Selection, which is held on the death of the Grand Master to select a successor to the Supreme Primateship of the Darwintern.