The council shall have two regular meetings in each year at times and places fixed by the council. The times for regular meetings shall be fixed so that there shall be an interval of at least four calendar months between such meetings. The council may meet in special meetings at any time and place at the call of the chairman. The executive committee shall have four regular meetings each year at times and places fixed by it, and may meet in special meetings at any time and place at the call of the chairman.