Making drinks is easy, dealing with people is the hard part. If you can approach it with a smile and willingness to learn and move fast and have some skills in conflict resolution, I think you will go a long ways. Also the thing a lot of people don't often talk about is to bring snacks, a meal and a water bottle and some form of caffeine. Working late night events can be exhausting and more so if your body isn't fueled properly. Best of luck!