It shall be the duty of each local board of education to hold a regular meeting during each calendar month for the transaction of business pertaining to the public schools. Any such meeting may be adjourned from time to time, and, in the absence of the president or secretary, the members of the local board may appoint one of their own number to serve temporarily. The local board shall annually determine the date of its meeting and shall publish it either in the official county organ or, at the option of the local board of education, in a newspaper having a general circulation in said county at least equal to that of the official county organ for two consecutive weeks following the setting of the date; provided, however, that the date shall not be changed more often than once in 12 months and, if changed, the new date shall also be published as provided in this Code section.