The Planning Commission shall adopt rules necessary to the conduct of its affairs in keeping with the provisions of this Part. Meetings shall be held at the call of the chairman and at such other times as the Commission may determine. The Commission shall keep minutes of its proceedings showing the vote of each member upon each question, or if absent or failing to vote, indicating the fact, and shall keep records of its examinations and other official actions all of which shall be a public record and be immediately filed in the office of the Commission.