What date was the race at the Symmons Plains Raceway?
CREATE TABLE "race_calendar_and_results" (
  "event" real,
  "circuit" text,
  "date" text,
  "pole_position" text,
  "race_1_winner" text,
  "race_2_winner" text,
  "race_3_winner" text
);
SELECT "date" FROM "race_calendar_and_results" WHERE "circuit"='Symmons Plains Raceway';