Lucid Dreams can certainly help you simulate the experience of standing on a stage. If you feel nervous about it in your dreams you can learn to recognise that feeling, get comfortable with it for real life and ofcourse you can also practise the material you are performing with. You can also do this by simply trying to immagine the scenario of standing in front of an audience throughout the day and go to bed with the intention of living that. That way you are more likely to get that dream, and that will help you forward even if you don't attain lucidity =)