In a surprise move, a Missouri bill to restore the presidential primaries might pass after all, even though previous such bills had been defeated. Senator Andrew Koenig inserted language for presidential primaries into an unrelated bill that had been in conference committee, and on May 4 the House passed it. See this story about SB 96. The date of the primaries might be April or March.
The Missouri Senate stripped out the presidential primary language yesterday.
https://www.fhqplus.com/i/120822475/missouri