What is the date of the episode in which the presenter is Johnny Vaughan?
CREATE TABLE "season_2006_07" (
  "date" text,
  "presenter" text,
  "guest_1" text,
  "guest_2" text,
  "guest_3" text,
  "guest_4" text
);
SELECT "date" FROM "season_2006_07" WHERE "presenter"='Johnny Vaughan';