For the purpose of maintaining order and preserving the peace and decorum upon grounds on which a fair and exhibition is held by an association the directors shall:
a. Have police jurisdiction upon the grounds and for a distance of one-quarter of a mile from the boundaries of the grounds;
b. Suppress the sale of intoxicating liquors by persons not regularly licensed by the public authorities; and
c. Prohibit every species of gambling and breach of the peace or laws of this state.