Speak with confidence. If you are confident in what you are saying, you will give off the impression that you speak to crowds of people often. If you are nervous, take a few deep breaths to help calm your nerves. Walk onto the stage with confidence keeping your head high and shoulders back. Do not fold your arms across your chest; use your arms while you are speaking. Be inviting to the crowd.
Speak briefly. The crowd is there to hear the bands and while you may be speaking to get them pumped up for the show, you do not want to talk so long they become bored. A minute or two of speaking will be enough to get the crowd enthusiastic or to keep the crowd excited for the next band.
Interact with the crowd immediately. Ask the crowd questions that they can respond to through cheers or applause such as "How is everyone tonight?" or "Is everyone excited for the show?" When the crowd begins to cheer, your confidence will rise and your conversation will flow easier.
Brainstorm and practice what you would like to say before you are on stage. If you have an idea of what you want to talk about you will be less likely to stumble over your words. For example, if you know you would like the audience to buy merchandise after the show, you can say, "You can help support our tour by picking up a copy of our CD at our merch-booth after the show!"