First impression counts
Dress appropriate for the event. Be clean, neat, elegant and comfortable enough to act naturally.
Your audience will base their first impressions on your appearance.
A good tip is to know your audience before the event starts.
Greet some of them when they arrive. Talk to them about..well about whatever you want. The purpose is to be friendly.
Studies have shown that it is a lot easier to talk to a group of friends than to a group of strangers.
Be pleasant, shake hands and exchange words. You have nothing to lose.