Tartan Day South honors the Celtic culture and heritage in South Carolina’s Midlands region. The traditions of the United Kingdom – Ireland, Scotland and England are showcased. The main event is in Cayce at the Historic Columbia Speedway on Saturday. Other free and paid events are held in West Columbia, Cayce and Lexington. The event is held to benefit the nonprofit River Alliance, which strives to connect people to our rivers – Broad, Saluda and Congaree – while protecting these bodies of water.