What is the 2009–10 when the 2007–08 shows n/a, and an Event of colonial square ladies classic?
CREATE TABLE "grand_slam_record" (
  "event" text,
  "2007_08" text,
  "2008_09" text,
  "2009_10" text,
  "2010_11" text
);
SELECT "2009_10" FROM "grand_slam_record" WHERE "2007_08"='n/a' AND "event"='colonial square ladies classic';