29 CFR 7.14: Oral proceedings.

(a) With respect to any proceeding before it, the Board may upon its own initiative or upon request of any interested person or party direct the interested persons or parties to appear before the Board or its designee at a specified time and place in order to simplify the issues presented or to take up any other matters which may tend to expedite or facilitate the disposition of the proceeding.

(b) In its discretion, the Board, or a single presiding member, may permit oral argument in any proceeding. The Board or the presiding member, shall prescribe the time and place for argument and the time allotted for argument. A petitioner wishing to make oral argument should make the request therefor in his petition.