Tenn. Code Ann. § 6-32-102

Special meetings shall be called by the clerk on the written request of the mayor, the manager, or any two (2) council members by providing each council member with twenty-four (24) hours written notice served personally or left at each of such council member's usual place of residence. Any special meeting at which all members of the council are present or have waived notice thereof in writing shall be a legal meeting for all purposes. Business transacted at any special meeting shall be limited to subjects recited in the notice of such meeting.