Colo. Rev. Stat. § 37-42-111
The board of directors shall hold its regular meetings at least four times each year, which may be immediately following the general election and on the first Tuesday of April, July, and October of each year, or, in the alternative, at such other times as may be designated in the bylaws, rules, or regulations adopted by the board, and such special meetings as are called, on at least five days' notice, by a majority of the board. All special and regular meetings must be held where practicable within the district or, if not so practicable, within the boundaries of any county in which the district is located, in whole or in part, or in any county so long as the meeting location is within twenty miles of the district boundaries. The provisions of this section governing the location of meetings may be waived only if the proposed change of location of a meeting of the board appears on the agenda of a regular or special meeting of the board and if a resolution is adopted by the board stating the reason for which a meeting of the board is to be held in a location other than under this section and further stating the date, time, and place of the meeting. In calling special meetings, the call must state specifically the business to be transacted, and none other shall be considered, but, at regular meetings, any business that the board of directors may legally transact may be acted upon. A majority of all members of the board must concur in order to bind the district or the board in any matter. All board meetings must be public, except for executive sessions to discuss confidential matters and to receive legal advice on specific legal questions, and the records thereof, except confidential records, are open to general public inspection during business hours. Irrigation districts may define confidential records and matters subject to executive session in the bylaws, rules, or regulations using section 24-6-402(4) as guidance.
C.R.S. § 37-42-111