One of the main things that performers at an open mic show worry about is forgetting what they are going to say. Not being prepared is like standing up on stage naked when everyone is laughing and pointing at you. The best way to make sure that this never happens is to be extremely prepared so that the performance will feel very natural, even if you are battling stage fright at the time.
Practice, Practice, Practice
Practice is the key to a good open mic performance. The simple truth is that the more you practice, the smoother and more natural your performance will be. It is good to start preparing your performance at least a week before the open mic show and set aside at least half an hour a day to practicing the performance. People who have already gone through their performance many times in advance are likely to find that it feels as natural as breathing when it is time to perform in front of an actual audience.
Grabbing a video recorder and getting a friend to record your performance can help in a large number of different ways. Firstly, you will be able to see exactly what you look like during your performance. This will indicate whether you need to work on bringing more movement into the performance or if you need to tone down things a little. This is also a good way to help you time your performance and make sure that it does not go on too long.
When Things Go Wrong
No matter what happens, it is important to keep going. Mistakes can easily be forgiven or ignored by the audience if the overall performance is strong. Instead of drawing attention to your mistake and even apologizing for it, simply keep on going and you are sure to find that you get back into your stride again before long.