Haw. Code R. § 20-1.1-24
Although in the usual course of disposition of a petition for a declaratory ruling no formal hearing will be granted to the petitioner or to a party in interest, the board may at its discretion order such proceeding set for hearing. Any petitioner or party in interest who desires a hearing on a petition for declaratory ruling shall set forth in detail in a request together with supporting affidavits or other written evidence the reasons why the matters alleged in the petition will not permit the fair and expeditious disposition of the petition. In addition, to the extent that the request for hearing is dependent upon factual assertions, the petitioner shall accompany the request with an affidavit establishing the facts. If a hearing is ordered by the board, sections 91-9 through 91-13, HRS, shall govern the proceedings.
Haw. Code R. § 20-1.1-24