(a) After notice of a meeting has been published, the Board may change the time or place of the meeting only if it announces the change publicly at the earliest practicable time.

(b) After notice of a meeting has been published, the Board may not change either the subject matter of the meeting or the decision that the meeting will be open to the public or closed unless both of the following conditions are met:

(1) By majority, recorded vote, the Board members determine that Board business requires the change and that no earlier announcement of the change was possible; and

(2) Notice of the change, and of the individual Board members' vote, is published in the Federal Register at the earliest practicable time.