Past President of the National Speakers Association Mike McKinley always
says, "Do not worry about minor mistakes when you are public speaking. The
audience does not know your script."
If you have lots of good material, it will make very little difference in the
big scheme of things if you forget to mention something you had planned to say
during your public speaking engagement. Such an omission
wouldn't make a BIG difference. Thus, it
isn't worth getting yourself so rattled because you left something out that you start a domino effect
of making additional mistakes and omissions.