How can you use Messages as a Host? You can use Messages to easily communicate with your guests in real-time. You can send a Broadcast message, which will send your message to ALL of your guests regardless of their RSVP status. You can send individual messages to guests as a way to hold private conversations about your event. As the Host, you can also start a group chat with up to 10 guests so that you can communicate with multiple people at the same time.