The National Council elects the National Board of Directors at the National Council Session (NCS). The National Board Development Committee prepares a single slate of candidates, and there is also provision for nominees from the floor provided the board chair is provided notice and written consent of the nominee at least 48 hours prior to the published start time of the NCS meeting when the election is to be held. In between National Council sessions, the National Board has the authority to fill vacancies until the next NCS.
Source: Constitution/ARTICLE X NATIONAL BOARD OF DIRECTORS/ELECTION OF MEMBERS TERMS 3. & Constitution/ARTICLE X NATIONAL BOARD OF DIRECTORS/VACANCIES 5.