What was the attendance on May 13?
CREATE TABLE "smythe_division_final_vs_3" (
  "date" text,
  "visitor" text,
  "score" text,
  "home" text,
  "decision" text,
  "attendance" real,
  "series" text
);
SELECT "attendance" FROM "smythe_division_final_vs_3" WHERE "date"='may 13';