Which date has a Crowd greater than 28,000, and a Home team of geelong?
CREATE TABLE "round_13" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);
SELECT "date" FROM "round_13" WHERE "crowd">'28,000' AND "home_team"='geelong';