(a) The Planning Commission shall fix the time for holding regular meetings, but it shall meet at least once in the months of January, April, July and October.
(b) Special meetings of the Commission may be called by the president or by two members, upon written request, by the secretary. The secretary shall send to all the members, at least two days in advance of a special meeting, a written notice fixing the time and place of the meeting.
(c) Written notice of special meetings is not required if the time of the special meeting has been fixed at a regular meeting, or if all members are present at the special meeting.