This is another excellent game to do. Simply start out with a group of commands. They must do what you say ONLY when you say Simon says so when you tell them to do something and you do not say Simon says and someone does it then they are out. Keep doing this until one person is left. That person is your winner.
Be creative and talk to the crowd as a single entity so they get comfortable with you. Once they do tell them to do things like Simon says clap your hands then wait a second and Yell STOP. Anyone who stops is out cause you didn’t say Simon says.