BOATING
Apple Cup, unlimited hydros, Lake Chelan, Wash, (also May 11).
Middle Atlantic Sailing Championship Regatta, Annapolis, Md. (also May 11).
GOLF
Eastern Intercollegiate Championships, New Haven, Conn. (through May 12).
HORSE RACING
Grey Lag Handicap, $50,000, 3-yr-olds and up, 1? m., Jamaica, N.Y.
[Television]Dixie Handicap, $25,000, 3-yr.-olds and up, 1 m. 3 f., Pimlico, Md., 4:30 p.m. ( CBS)*.
Delaware Valley Stakes, $25,000, 3-yr.-olds, 6 f., Garden State, N.J.
Debonair Stakes, $25,000, 3-yr-olds (colts and geldings), 6 f., Hollywood Park, Calif.
HUNT RACING
Radnor Hunt Club, Malvern, Pa.
Iroquois Hunt Club, Nashville.
LACROSSE
Navy vs. Johns Hopkins, Annapolis, Md.
TRACK & FIELD
West Coast Relays, Fresno, Calif.
Sunday, May 11