Have you DJed at my venue before?
Although it is not a requirement that your DJ has worked at your venue before, it helps. Some venues are easy/straightforward for setup and others are not! If your potential DJ has not DJed at your venue before, ask them how they will prepare for that venue? At the very least, the DJ should plan to reach out with the venue’s events person to find out details about uploading, parking, power and layout. Often the right course of action is for the DJ to do a site visit ahead of your wedding so they truly know that lay of the land before your big day!