From the home page of your event planner interface, go to “messages”. Then hit the “mobile push notification” button, and “send a new message”. Write the message (and an optional title) you want your audience to receive and press “save changes”. Your message will be sent within a few seconds.
Then, your attendees and speakers will receive the push notification in their devices’ notification center, or in the app while they are using it.
Be careful: Messages are sent immediately.