In any suit, action, or proceeding involving the validity or enforcement of, or relating to, any contract, proceeding, or action of the district, the district shall be deemed to have been established, in accordance with this part, upon proof of the issuance of the certificate by the secretary of state. A copy of the certificate duly certified by the secretary of state shall be admissible in evidence in any suit, action, or proceeding and shall be proof of the filing and contents thereof.