It is unlawful for a person under 21 to enter a licensed establishment with the intent to purchase, to be served or delivered any alcohol beverages. However, no city ordinance may prohibit a person 18,19 or 20 years of age from entering an establishment to:
(A) Perform work for the establishment, including the serving of alcoholic beverages;
(B) Consume meals; and
(C) Attend social functions that are held in a portion of the establishment where liquor is not sold.
Penalty, see § 111.99