Cal. Bus. & Prof. Code § 23357
(a) A licensed beer manufacturer may, at the licensed premises of production, sell to consumers for consumption off the premises beer that is produced and bottled by, or produced and packaged for, that manufacturer. Licensed beer manufacturers may also exercise any of the following privileges:
(4)
(A) Permit consumers to leave the premises with open containers of alcoholic beverages for consumption off the premises within an entertainment zone if all of the following conditions are satisfied: