Missouri constitution
Article III: legislative department
Section 20

The general assembly shall
meet on the first Wednesday after the first Monday in January
following each general
election. The general assembly may provide by law for the introduction of bills during
the period between the first day of December
and the first Wednesday after the first
Monday of January.
The general assembly shall reconvene on the first Wednesday after the first Monday
of January after adjournment at midnight on May thirtieth of the preceding year. A
majority of the elected members of each house shall constitute a quorum to do business,
but a smaller number may adjourn from day to day, and may compel the attendance
of absent members in such manner and under such penalties as each house may
provide. The sessions of each house shall be held with open doors, except in cases
which may require secrecy but not including
the final vote on bills, resolutions and
confirmations. Neither house shall, without the consent of the other, adjourn for more
than ten days at any one time, nor to any other place than that in which the two houses
may be sitting.