Name the most crowd for essendon
CREATE TABLE "group_1" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "ground" text,
  "date" text,
  "crowd" real
);
SELECT MAX("crowd") FROM "group_1" WHERE "away_team"='Essendon';