Such repetition will reinforce your message. This should be your speech's goal. By concluding with your plea for action your audience will remember it longer. Talking overtime is rude to other speakers and the audience. Be sure your notes are lettered large and clear.
Nothing makes a speech perfect except practice.
Practice with your equipment and assistants, if you are using them. When re hearsing have someone critique your performance or check your own mistakes with videotape or a tape recorder. Be sure everything is working to your satisfaction. Check on replacements in case of a breakdown . Don't overshadow your speech with flashy apparel.