When utilizing improvisation during your live event, you don't have to disregard your structure, goals, or key points. It just means that you must be attentive to the cues and signals from your audience, and alter your speech accordingly. For instance, you can start with an icebreaker or a hook that relates to your audience or the event's theme. You could also use stories, anecdotes, or examples that are pertinent and personal to your audience. Additionally, you could ask questions or invite feedback from your audience, and answer their answers or reactions. Furthermore, you can use humor, gestures, or props to make your speech more vibrant and entertaining. You can also change the pace, tone, or volume of your speech to match the mood and energy of your audience. Lastly, you can conclude with a call to action or a takeaway that summarizes your main message and energizes your audience.