Take a deep breath before going on stage, tell yourself that this is just a simple performance, and give yourself a relaxed attitude. It's best not to stand in the audience, but to look straight ahead. What you see in your mind is the picture of your poem, a feeling of intoxication. Don't think about whether you read well or not, don't think about the reaction of the audience, and naturally express your feelings. It is normal to exercise yourself through big occasions!
Of course, there are still some tips.
First, make full preparations and make more predictions. You can invite a few friends to have a look first. Recently, you can come to the party stage for two sessions by yourself. For beginners, you can design positions and gestures in advance to avoid being in a hurry.
Second, relax before the party. Keep in touch frequently a few days before the party, and you can relax properly the day before the party.
Third, relax before going on stage, and relax yourself by shouting, making faces and other traditional ways.
Finally, on the stage, for beginners, look empty and watch the audience. Actually, you didn't see it clearly. The advice for myopia is not to wear glasses. It's easy to get nervous if you can't see clearly.
I wish you success!