Who was the visiting team in the game sometime after number 29 that had 18,584 atttendees?
CREATE TABLE "december" (
  "game" real,
  "date" text,
  "visitor" text,
  "score" text,
  "home" text,
  "decision" text,
  "attendance" real,
  "record" text
);
SELECT "visitor" FROM "december" WHERE "game">29 AND "attendance">'18,584';