Edinburgh preview season continues with this double bill of funny at Crack Comedy South Bank. Tonight, a super secret special guest will be dropping in; we can't tell you more than that they're a massive star, so you'll have to head down to see who. Meanwhile, Al Lubel and Gráinne Maguire put their award-winning comedy to the test with new shows. Over 18s only. Please note that acts are subject to change without notice.