FaceTime with Multiple People at Once

 Although you might not want video chat with over 30 people at once, you can easily video call with a few. To start a Group FaceTime, tap on the plus sign in the top right, and add every person you want to call. Once you're finished adding members, hit the green video button, and you'll launch the group call. You must then wait for the others to join.

You can also start group chats from Messages (in group chats), add more people to an existing group call, rejoin a Group FaceTime, and more. Check out Justin's thorough article on Group FaceTime chats to learn more about supported devices, required software, and other details.