California Code, Business and Professions Code - BPC § 24045.18

Notwithstanding any other provision of this division, a beer and wine wholesaler that also holds an off-sale beer and wine retail license and only sells wine or the holder of a limited off-sale retail wine license may assist a nonprofit organization holding a temporary wine license in conducting a winetasting.  The privilege granted under this section for a beer and wine wholesaler that also holds an off-sale beer and wine retail license and only sells wine or the holder of a limited off-sale retail wine license shall apply only to wine produced for the donating licensee that is labeled with a brand owned exclusively by the donating licensee and shall include in the tasting only wine donated by the licensee to the event.