DLT, Christian Knowles open blue book for artist management DetailsEditor | 07 July 2019 Production and distribution company DLT Entertainment has joined forces with comedy promoter and manager Christian Knowles to launch Blue Book Artist Management agency.Knowles previously founded CKP in 2001 to specialise in development of comic talent for TV, radio and live events, which was acquired by the InterTalent Rights Group three years ago.Blue Book Artist Management marks DLT Entertainment