The annual Blue and Silver Ball honoring six health facilities employees on St. Thomas and St. John will take place at Marriott's Frenchman's Reef Beach Resort. Being recognized are Dionidas Anthony of the Myrah Keating Smith Health Center; and Joyce Benjamin-Correa, Celeste Brin, Myris Guishard, John Olive and Dr. Vicente Poblete of Roy L. Schneider Hospital. Tickets for the buffet dinner-dance are $35; call 776-8311, ext. 2273 or 5092 for reservations.