Giving a TEDx talk? Fantastic! You must be thrilled/terrified/nauseous/overwhelmed! Certainly, there's a lot on your mind right now--your talk has a lot to live up to, and you're probably feeling the pressure. How are you going to get your message across? Is it going to be interesting? Where to start?
All TED events are managed by a committee, including one that oversees the speaker selection. Often, committee members have some ideas on who they would like to attend and speak at the event. However, all of the events also accept nominations for speakers as well, especially those who fit their specific theme.