1. Pray.
2. Warm up.
3. Do your "thing". (smoke, drink a little, jump, *some do drugs but i dont reccomend this.*, etc.)
4. Inhale exhale.
5. Don't pay attention too much on the audience. Focus most of the time to the music.
6. Enjoy and have fun.
**** If possible go to the gig site early to get the feel and the atmosphere of the place. If the drumkit is there, sit on it and play simple beats and rolls or whatever you want to play. By this, you will feel comfortable and will help you lessen the pressure in your part. Plus you will know already what things to bring with you and the adjustments you will make because you already know the condition of the drumkit there.******
hope this helps dude.... rock en roll!!!!