Permits for private events
The question is not which permit. It is whether there is a sale.
South Carolina treats an event as requiring a permit if money touches the alcohol in almost any way: a charge per drink, an admission fee that includes a drink, a ticket price covering a drink, donations, or sponsorship accepted at an event where alcohol is provided. That last one surprises people.
An unlicensed social function is noncommercial, charges no admission, provides alcohol at no charge, and has an unlicensed host. A wedding reception is the state's own example. The critical limit, in DOR's words, is that a bartender, caterer or event hall may not provide the alcohol for the event to qualify.
A bartending service may act as the host's agent to purchase and deliver alcohol, but reimbursed at cost only. Any markup is an unlicensed sale carrying criminal penalties. Our fee is a predetermined service charge and never comes out of alcohol sales, tickets, donations or sponsorships. Leftover alcohol is yours.
One structural limit worth knowing: a bartending or catering company can hold a beer and wine special event permit, but never a liquor special event permit. Those are restricted to nonprofits.
SourceS.C. Rev. Rul. #12-3; S.C. Code Reg. § 7-403(B); S.C. Code §§ 61-4-510, 61-6-2000, 61-2-185