Being invited to speak at an event confers some benefits. For newer speakers, the most obvious benefit of speaking is to advance your career. Speaking at an event confers a certain amount of legitimacy and status. The fact that you’re on stage and other people are listening to you implies that you’re somebody who deserves to be listened to; that your ideas hold value that the other people in the audience will benefit from them. This is a great thing to have in your back pocket at interviews, and is sure to impress the person doing the interviewing.