Cal. R. 3.514
All factual matters to be heard on any petition for coordination, or on any other petition, motion, or application under the rules in this chapter, must be initially presented and heard on declarations, answers to interrogatories or requests for admissions, depositions, or matters judicially noticed. Oral testimony will not be permitted at a hearing except as the assigned judge may permit to resolve factual issues shown by the declarations, responses to discovery, or matters judicially noticed to be in dispute. Only parties that have submitted a petition or motion, or a written response or opposition to a petition or motion, will be permitted to appear at the hearing, except the assigned judge may permit other parties to appear, on a showing of good cause.
Cal. R. Ct. 3.514