All notices of hearings upon any calendar shall specifically state the purpose of the hearing and any evidence to be produced by the parties. Notice shall be mailed to:
not less than eight days before the date of hearing. In the discretion of the board any issue in a case may be considered and determined although not indicated in the notice of hearing if the administration of justice will thereby be substantially served. Notice of any hearing may be dispensed with by the board when the parties are present or have consented thereto.
N.Y. Comp. Codes R. & Regs. Tit. 12 § 300.8