Broadcast messages: Advertising messages are displayed in the Travel Agents "queue" where they usually retrieve messages from suppliers regarding their bookings.
In P2P mode, a message producer sends a message to a specific message consumer through a queue, whereas pub-sub is intended for the one-to-many or many-to-many broadcast of messages.
Try to listen to the radio broadcast inside the Expo Park. It will tell you which pavilions are crowded and how long it will take to get through a queue.