Mo. Rev. Stat. § 321.450: Cases arising under this chapter to be advanced on docket — courts always open.

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 the provisions of this chapter, 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 this chapter.