According to Speaker Rich Hopkins, your best speech practice happens when you do your complete speech without stopping. While it is tempting to stop and check your notes when you forget something, instead say something else, power through the forgetfulness, and continue on with your speech. This will train you to be ready for mental mistakes onstage, so if you do forget something in your speech, you can smoothly and easily transition through it.
Onward,
Tim Wilson
Professional Speech Coach
Free speaking tips at: http://speakingquicktips.blogspot.com