Meetings of the commission shall be held at such places and at such times as the commission shall from time to time prescribe. Meetings of the commission, except executive sessions, shall be open to the public. Public hearings shall be held upon at least thirty (30) days' notice, such notice to be given by publication in at least one (1) newspaper printed and published in Montgomery County and one (1) newspaper printed and published in Prince George's County. (Mont. Co. Code 1965, § 72-9; 1965, ch. 870, § 1.)