In the event of an emergency or disaster, the Governor shall call the Legislature into session as soon as practicable, and in any case within thirty (30) days following the inception of the emergency or disaster. Each legislator and each emergency interim successor, unless the Governor is certain that the legislator to whose powers and duties the legislator is designated to succeed or any emergency interim successor higher in order of succession will not be unavailable, shall proceed to the place of session as expeditiously as practicable. At such session or at any session in operation at the inception of the emergency or disaster, and at any subsequent session, limitations on the length of session and on the subjects which may be acted upon shall be suspended.