Should you do a venue walk-through?
The better question would be is why aren't you doing a venue walk-through?
does your DJ know where to setup? is there power issues? Where can we store our gear?
does the DJ, Photographer, and Coordinator all have the same schedule?
are the tables in the right spot? what about uplighting?
lots of questions to ask all your vendors in the areas that would pertain to them, but your DJ should be able to answer most if not all of your questions about the venue your going to be at, or at least find out the answers.