I just want to add:
Smile, keep hands below weist line when walking and standing even if you have something in your hand (drink, beer, etc). Walk calm, slowly, and no sudden movements this also goes when standing and talking. Don't look down. Don't be stiff relax. Be confident you own the place.
When talking: Try to focus on your group. Don't be looking around the place like a predator do this without actually doing it, laugh hard, take lots of pictures, behave in a way that when people see you they want to joing your group. Have a good time. Dance, make your group laugh, etc... Call attention to your group. Do the same thing other groups that are having a good time and call your attention do.
Hope that helps...
~ Smoosh