This is an email
Dear All, Just to advise everyone that Liz and JL will be arriving late for Pop-Pop's dinner on Friday, October 12, because she is chairing an event that evening. Her event is billed until 7:30 p.m. but due to the fact that she is a chair she won't be able to leave until it is over. Therefore, we will not take the big group photo until they arrive. Thanks, Linda, Mom

What is the subject of this email?
Family Photographs