Had that problem a few years back.
Got skoog in (pre-agaric), always wanted him at our events.
Promoted like mad, as we always used to.
Got a really low turn out, apart from a bunch of japanese who obviously knew who he was, london punters as a whole, all though they had all danced to his tunes as played by other DJ`s, they just didn`t know who skoog was.
Bad crazyness.
London is extra difficult though, and the crowds are super fickle for the biggest names only.