What were the guests that aired on 7 June 2010?
CREATE TABLE "table1_26733129_1" (
  "episode_number" real,
  "air_date" text,
  "guests" text,
  "three_darts_challenge" text,
  "musical_performance" text
);
SELECT "guests" FROM "table1_26733129_1" WHERE "air_date"='7 June 2010';