The Federal Rules of Civil Procedure
District Courts & Clerks: Conducting Business; Issuing Orders
Hearing Motions; Submission on Briefs
(a) Providing a Regular Schedule for Oral Hearings. A court may establish regular times and places for oral hearings on motions.
(b) Providing for Submission on Briefs. By rule or order, the court may provide for submitting and determining motions on briefs, without oral hearings.