Nigeria Health Watch is hosting a crucial public health event. You are tasked with live-tweeting the event. How would you utilise different formats (text, images, videos) to keep the audience engaged, offer real-time insights, and create a lasting online presence for the event?

1. Preparation: Before the event, familiarize yourself with the agenda, speakers, and topics to be discussed. This will help you anticipate key moments to capture and share. Also, create a unique, catchy hashtag for the event. This will help to track the conversation and increase visibility.

2. Text: Use text to provide real-time updates and key takeaways from the speakers. Make sure to include the event's hashtag in all your tweets. Also, tag the speakers and relevant organizations in your tweets to increase reach.

3. Images: Use images to give your audience a feel of the event. This could be pictures of the venue, speakers, attendees, etc. You can also create infographics of key statistics or points mentioned at the event.

4. Videos: Videos are a great way to capture and share key moments from the event. This could be a clip of a speaker making a key point, a panel discussion, or even reactions from attendees.

5. Engagement: Encourage your followers to engage with your tweets by asking questions or seeking their opinions on the topics being discussed. Retweet relevant tweets from attendees or those following the conversation online.

6. Recap: After the event, share a recap or summary of the key points discussed. This could be in the form of a Twitter thread or a blog post that you can link to.

7. Follow-up: Keep the conversation going even after the event by sharing more in-depth content related to the topics discussed. This could be articles, research papers, or even follow-up discussions with the speakers.

Remember, the goal is not just to share what's happening at the event, but to engage your audience, stimulate conversation, and create a lasting online presence for the event.