Conclave

The Conclave is the ruling council of the maesters of Westeros. It is based in the Citadel in Oldtown.

Season 2
The Conclave meets in Oldtown to discuss the changing weather patterns. They agree that summer has ended and that autumn has arrived. As is traditional, they send this news to all corners of Westeros with special white ravens. Grand Maester Pycelle relays this news to the small council, prompting them to start tallying the supplies and stores the people of the Seven Kingdoms have put aside for the coming winter. .

In the books
In the Song of Ice and Fire novels, the Conclave is made up of the ruling archmaesters of the Citadel. As well as discussing the change of the seasons, the Conclave elects the new Grand Maester after the passing of the old, decide on policy and see to the administration of the Citadel and the training of new recruits. The Conclave also appoints the Seneschal, the maester who has to run the bureaucracy of the Citadel on a day-to-day basis, which is considered drudgery.