During Dave Chappelle's residency at Radio City Music Hall this August, he will be joined each night by various special guests from the comedy and music worlds, such as The Roots, Chris Rock, Erykah Badu, Lauryn Hill, Childish Gambino, Trevor Noah, Chance the Rapper and others. But on Aug 15 he is only advertising the show as with a "very special guest." This could be because the artist is already on their own tour and isn't allowed to advertise competing appearances, or it could be for other contractural reasons. Or maybe he hasn't actually booked someone yet? Who do we think it could be?