Motormichael, I just got done runing my first enduro last Sunday (Brown Mtn. Lights, SETRA). I had the same question you've got. I have a KDX 200, so I just made sure that the lights worked, put my stock muffler/spark arrester back on , and borrowed a license plate for the day. I noticed that there were all kinds of MX bikes with flashlights taped to the front fender and tiny battery operated red lights on the rear fenders. I even saw one guy with a car license plate taped to the back of his chest protector. The cops were cool for us and didn't give any one a hard time, except for the one that didn't know about the enduro and actually pulled a couple of guys over. He figured it out when a bunch of other bikes started to come by. He did however check their licence.
Anyway, I had a blast at my first enduro. I have been racing harescrambles for years and have always wanted to ride an enduro. I am glad I finally did. You might really want to consider buying an enduro roll chart. Once I fgured out how to properly use it :think about the 3rd moto it really made things easier. Also don't let the harescramble "blood" :p get you into too big of a hurry. I burned my first check by 5 minutes, my 3rd check by 9 minutes. That is NOT a good thing :( . I actually zeroed a couple of checks when I figured out what I was doing. Have a blast a your first enduro, and remember it is not about being fast, it is about being fast enough.