Mo. Rev. Stat. § 247.660: Cases involving validity of organization, when heard.

All cases in which there may arise a question of the validity of the organization of a district, or a question of the validity of any proceeding under sections 247.230 to 247.670, shall be advanced on the docket as a matter of immediate public interest and concern, and heard at the earliest practicable moment. The courts shall be open at all times for the purposes of sections 247.230 to 247.670.