Tenn. Code Ann. § 48-57-203: Quorum requirements

(a) Unless chapters 51-68 of this title or the charter or bylaws provide for a higher or lower quorum, ten percent (10%) of the votes entitled to be cast on a matter must be represented at a meeting of members to constitute a quorum on that matter.

(b) An amendment to the charter or bylaws that adds, changes, or deletes a greater quorum or voting requirement shall meet the same quorum requirement in subsection (a) and be adopted by the same vote and voting groups required to take action under the quorum and voting requirements then in effect or proposed to be adopted, whichever is greater.

(c) When a quorum is once present to organize a meeting, a meeting may be adjourned despite the absence of a quorum caused by the subsequent withdrawal of any of those present.