21 TRADE MARKS REGULATIONS, 1970 (L.I. 667) shall be lawful to do the act or thing on the first day following such excluded day which is not an excluded day. Regulation 55—Hearing Given Under Discretionary Power. (1) Before exercising adversely to any person any discretionary power given to the Registrar by the Act or by these Regulations, the Registrar shall if so required hear such person thereon. (2) An application for a hearing shall be made within one month from the date of notification by the Registrar of any objection to an application or the date of any other indication that he proposes to exercise a discretionary power. (3) Upon receiving such application the Registrar shall give the person applying ten days' notice of a time when he may be heard. Within five days from the date when such notice would be delivered in the ordinary course of post the person applying shall notify the Registrar whether or not he intends to be heard on the matter. (4) The hearing before the Registrar of any dispute between two of more parties relating to any matter in connection with a registered trade mark or an application to register a trade mark shall be in public unless the Registrar, after consultation with those parties to the dispute who are represented at the hearing, otherwise directs. (5) The decision of the Registrar in the exercise of any such discretionary power as aforesaid shall be notified to the person affected. Regulation 56—Dispensing with Evidence. Where under these Regulations any person is required to do any act or thing, or to sign any document, or to make any declaration on behalf of himself or of any body corporate, or any document or evidence is required to be produced to or left with the Registrar, or at the office of the Registrar, and it is shown to the satisfaction of the Registrar that from any reasonable cause such person is unable to do such act or thing, or to sign such document, or to make such declaration, or that such document or evidence cannot be produced or left as aforesaid, it shall be lawful for the Registrar, upon the production of such other evidence" and subject to such terms as he may think fit, to dispense with any such act or thing, signature, declaration, document or evidence. Regulation 57—Amendment of Documents. Any document or drawing or other representation of a trade mark may be amended, and any irregularity in procedure which in the opinion of the Registrar may be excused without detriment to the interests of any person may be corrected, if the Registrar thinks fit, and on such terms as he may direct.