In addition, two plunges are set for Friday: Frigid Friday (noon), for school groups; and a Police Plunge (1 p.m.), in which about 350 police officers will dive in.
Plungefest, a series of events surrounding the plunge, begins at 8 a.m. Saturday. Offerings include food, live music, vendors and activities that don't involve diving into freezing water.
Admission is free. Parking is available at Navy-Marine Corps Memorial Stadium, Rowe Boulevard and Taylor Avenue in Annapolis; Anne Arundel Community College, 101 College Parkway in Arnold; and Kent Island High School, 900 Love Point Road in Stevensville. Information: plungemd.com