No. Nothing can be bought or sold at the event.
It is unfortunate that alcohol is such a sticking point with the Fairgrounds. They will not budge on their rule, “no outside alcohol.” A marginal alternative would be if they had a bar, where people could purchase a drink.
However, Burning Man Org will not budge on their principle, “no buying or selling.” Accordingly, the Santa Cruz Regional is in a very awkward, and frustrating position.
Please ask someone who’s been in the past. And…speakeasy!.