Instant Message to everyone arriving.
"Welcome Bill, enjoy a 10% discount today only."
"The Auditorium entrance is closed for remodeling today, use the South Building Entrance."
"Welcome to the Tournament, we are having a 30 minute Weather Delay because of Frost. Find your assigned cart numbers and enjoy the Continental Breakfast sponsored by Discount Tire." (Then that link to Discount Tire needs to be Instant. Think how Discount tire wants their message to be displayed, do you think they want to have customers waiting? Think this feature will help you get sponsors for your next event?)