What event did Sjerstin Vermeulen receive a 66.452 result?
CREATE TABLE "equestrian" (
  "athlete" text,
  "class" text,
  "horse" text,
  "event" text,
  "result" text,
  "rank" text
);
SELECT "event" FROM "equestrian" WHERE "athlete"='sjerstin vermeulen' AND "result"='66.452';