What was the date that featured a score of 8.8 (56) for the away team?
CREATE TABLE "round_19" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);
SELECT "date" FROM "round_19" WHERE "away_team_score"='8.8 (56)';