Four members of the Planning Commission shall constitute a quorum. All affirmative actions of the Planning Commission shall be determined by a majority vote of the total Commission at a meeting of which a quorum is present; provided, that where State laws or County ordinances require a vote larger than the majority of a quorum, then such provisions shall govern. The Planning Commission shall hold not less than one regular meeting in each month; provided, that if no matters over which the Planning Commission has jurisdiction are pending upon its calendar, a meeting may be canceled.