Make waves to fight cancer during this family-friendly fundraiser hosted by Swim Across America. Participate in a half-mile or a one-and-a-half mile open water swim or a same day pool option, then stick around for an after party with Olympic swimmers. Proceeds benefit the Ferreira Lab at Hollings Cancer Center at the Medical University of South Carolina, which is dedicated to developing treatment for autoimmune diseases and cancer. Kiawah Island Golf Resort, 1 Sanctuary Beach Dr., Kiawah Island. Saturday, 6:30am-noon. Free, donations encouraged. www.swimacrossamerica.org/charleston