On what weekday was the match that had Perth Glory as the away team?
CREATE TABLE "top_10_attendances" (
  "attendance" real,
  "round" text,
  "date" text,
  "home" text,
  "score" text,
  "away" text,
  "venue" text,
  "weekday" text,
  "time_of_day" text
);
SELECT "weekday" FROM "top_10_attendances" WHERE "away"='perth glory';