C.R.S. § 7-58-813

(1) Unless the articles or bylaws otherwise provide, a board of directors may establish a time, date, and place for regular board meetings, and notice of the time, date, place, or purpose of those meetings is not required. (2) Unless the articles or bylaws otherwise provide, notice of the time, date, and place of a special meeting of a board of directors must be given to all directors at least three days before the meeting, the notice must contain a statement of the purpose of the meeting, and the meeting is limited to the matters contained in the statement.