What venue has an attendance of 30824 at Essendon in 1984?
CREATE TABLE "double_premiership_teams" (
  "season" real,
  "premier" text,
  "runner_up" text,
  "score" text,
  "venue" text,
  "attendance" real,
  "premiership" text
);
SELECT "venue" FROM "double_premiership_teams" WHERE "premier"='Essendon' AND "attendance"=30824;