The board shall have four regular meetings in each year, one in January, one in April, one in July, and one in October, for the purpose of transacting business which may properly come before it, and as many special or adjourned meetings as the board may deem necessary, on call of the chair of the board. Special or adjourned meetings may be held at the time the board provides in the bylaws or at a time the board may provide by reasonable resolution. Due notice of each regular meeting and the time and place thereof shall be given to each member by mail at least one week prior to the meeting. Three members of the board shall constitute a quorum.