Lets all remember this DJ said it was an "Agent Gig" so he really doesn't know the client and there lies another problem...personally I felt bad for the DJ in question but thats part of the business only experience can determine how you have to handle it delicately to make all involved have a great time..
and guess what? the next gig will be a totally different scenario to handle...its a new world out there in the trenches...adapt or go home.