Okla. Stat. tit. 37A, §§ 2-163
A holder of a small farm winery, winemaker, or small brewer license, which serves wine or beer for on-premises or off-premises consumption, with permission from the event coordinator, manager, or the property owner, shall be allowed to serve free samples of, sell, or serve Oklahoma-manufactured beer, wine, mulled wine, or spiced wine, mixed with nonalcoholic beverages or food items, such as water, sugar, fruits and vegetables, at any temperature, wine produced at the winery or blended on-site at any public event, including but not limited to festivals, trade shows, boat shows, RV shows, home and garden shows, fairs, car shows, swap meets, sporting events, city events, county events, state events, for either onpremises or off-premises consumption, including any public events that are held at the premises which hold a retail beer license, retail spirits license, mixed beverage license, beer and wine license, caterer's license, special event license, public event license, winemaker license, small farm winery license, charitable auction license, or brewpub license. When attending a public event, the location within the event occupied by the small farm winery, winemaker, or small brewer licensee becomes a licensed premises and extension of the licensed small farm winery, winemaker, or small brewer license. The licensee shall set up and define an area contiguous to their booth space as a serving area where the wine or beer is dispensed. The licensee may only serve the wine or beer in the serving area. In the event that multiple winemakers or small brewers are at the same public event, they may combine their serving areas into one area as long as they are contiguous to the winemakers' or small brewers' booths. A small farm winery, winemaker, or small brewer licensee shall not be required to control the consumer leaving the premises once served Oklahoma-manufactured beer, wine, mulled wine, or spiced wine, mixed with nonalcoholic beverages or food items, such as water, sugar, fruits and vegetables, at any temperature, wine produced at the winery or blended on-site at the public event. There shall not be any special permit, permit, or license required by the event originator, coordinator, manager, or property owner to have a small farm winery, winemaker, or small brewer licensee at his or her event.
Okla. Stat. tit. 37A, §§ 2-163