Final answer:
The manager and the establishment could encounter legal action, negative publicity, and loss of business if sexual advances by a patron towards a server are not stopped, as this behavior falls under the category of sexual harassment.
Step-by-step explanation:
If a patron of a tavern begins to make sexual advances toward a server and this behavior is not stopped, the establishment and its manager could face serious consequences including sexual harassment claims. Sexual harassment encompasses unsolicited sexual advances that can affect a person's employment, interfere with job performance, or create a hostile work environment. Specifically, the establishment could be at risk of facing legal action, negative publicity, and potential loss of business. Moreover, if the harassment can be classified as quid pro quo or as creating a hostile work environment, there are legal ramifications under employment law that can result in fines, penalties, or even the revocation of the establishment's operating license.