The board of directors of the district shall meet at its usual place of meeting within thirty days after each election and canvass the returns. If all the returns have not been received, the canvass shall be postponed from day to day until all the returns have been received. The canvass shall be made in public and by opening the returns and ascertaining the vote for each person voted for, and declaring the result thereof, and also ascertaining the vote for and against each and every question or proposition voted upon, and declaring the result thereof.