Speak in the first-person narrative. Speaking in the first person, which is the "I" point of view, gives the narrative authority and suggests to the audience that you have experienced the event.
Use words in the present tense, rather than past. Keep the narrative authentic by using the same language (phrases and slang) that you would use in everyday speaking.
Begin a narrative piece using something with which you are familiar, or if you're close to someone who's experienced a certain event. Firsthand experience in a topic will help you stay in the narrative and stay focused on the topic.
Avoid saying too much, or too little, about the event. Use only relevant details in the narrative to prevent the audience from feeling overwhelmed by all of the details. A narrative allows a reader or listener to include her own imagination in the story.
Use words and sentences that come naturally to you when you use a narrative voice. Avoid using uncommon words or overly wordy, complex sentences when you speak or write, so the audience easily follows your entire piece without confusion.