It's your party and you should dance if you want too. Having a Dj is like having a scripted show, so make sure they know the tunes that makes you shuffle and slide. Not every event needs a Dj but if you plan on tearing up the dance floor don't leave home without one. The DJ sets the tone and musical theme for your event, it is their profession to comb through thousands of songs and pick the ones that would make you smile. My best recommendation is have the DJ create a play list before your event and have you sign off on it.