What date(s) was the game(s) at Candlestick Park?
CREATE TABLE "2010s_49ers_3_2_1" (
  "year" real,
  "date" text,
  "home_team" text,
  "result" text,
  "visiting_team" text,
  "venue" text
);
SELECT "date" FROM "2010s_49ers_3_2_1" WHERE "venue"='candlestick park';