The commissioners shall have an office at Montgomery, Alabama, and shall meet there a minimum of once a month, with the public information officer giving notice of the monthly meeting at least one week prior to the meeting, and shall remain in session until all business before them is disposed of; and they shall hold other meetings at such times and places as may be necessary for the proper discharge of their duty, or as the convenience of parties in the judgment of the commission may require. They shall keep a record of all their proceedings, which shall be open at all times to the inspection of the public.