(a) The Legislature shall convene in regular session at noon on the first Monday in December of each even-numbered year and each house shall immediately organize. Each session of the Legislature shall adjourn sine die by operation of the Constitution at midnight on November 30 of the following even-numbered year.

  (b) On extraordinary occasions the Governor by proclamation may cause the Legislature to assemble in special session. When so assembled it has power to legislate only on subjects specified in the proclamation but may provide for expenses and other matters incidental to the session.