45 CFR §614.6

1. (a)The time or place of a meeting of the National Science Board that has been publicly announced as provided in § 614.5 may subsequently be changed, but any such change will be publicly announced at the earliest practicable time.
2. (b)The subject matter of any portion of any meeting of the Board that has been publicly announced as provided in § 614.5 or the determination whether any portion of any meeting so publicly announced will be open or closed may subsequently be changed, but only when:
   1. (1)The Board determines by record vote that agency business so requires and that no earlier announcement of the change was possible; and
   2. (2)The Board publicly announces the change and the vote of each Member on the change at the earliest practicable time.