Which event is a win by an opponent of Nicolas Smith, with the round marked n/a?
CREATE TABLE "mixed_martial_arts_record" (
  "res" text,
  "record" text,
  "opponent" text,
  "method" text,
  "event" text,
  "round" text
);
SELECT "event" FROM "mixed_martial_arts_record" WHERE "res"='win' AND "round"='n/a' AND "opponent"='nicolas smith';