“Citrus fruit fair” means any citrus fruit fair or citrus fruit fair and exposition which satisfies all of the following requirements:
(a) Has been conducted and carried on by an association for not less than four or more than 15 consecutive days during each calendar year for a period of not less than 20 consecutive years.
(b) Citrus fruits are exhibited for prizes and premiums at the fair. The fair has for its purpose the promotion and encouragement of the citrus fruit industry of this state.