This is a part of the Navigating Stage. See the introduction for more information.

Announcements are an easy way to get information out to all your guests or a specific group of guests. Create new messages and review sent ones here; announcements are sent to the email addresses of the guests that you specify. You are able to delete announcements, but Conference Joy will continue to show that the announcement was sent, just as a reminder to you that you actually did send an announcement out.