
Sarah H. answered 07/03/19
Spanish and ESL tutor specializing in conversational and cultural appr
Hi!
Your friend is correct. It is not customary to address people directly by using the word dear. It is definitely reserved for something more formal like letter writing. There are so many ways to begin addressing a group in a speech or presentation. It completely depends upon the audience and the context of the speech or presentation. To begin by saying "ladies and gentlemen" is a little more formal but is typically appropriate for most scenarios.
I would recommend searching the Internet or looking for books about giving speeches or presentations and how to begin them effectively. I think there are a lot of resources out there that can help.