What is the date of the match where vampiro was the winner in Mexico City?
CREATE TABLE "luchas_de_apuestas_record" (
  "wager" text,
  "winner" text,
  "loser" text,
  "location" text,
  "date" text
);
SELECT "date" FROM "luchas_de_apuestas_record" WHERE "location"='mexico city' AND "winner"='vampiro';