What is the date of the game with Detroit as the visitor team?
CREATE TABLE "quarter_finals_1_vs_nashville_predators_" (
  "date" text,
  "visitor" text,
  "score" text,
  "home" text,
  "decision" text,
  "attendance" real,
  "series" text
);
SELECT "date" FROM "quarter_finals_1_vs_nashville_predators_" WHERE "visitor"='detroit';