You can give the same talk more than once! Most people who give talks give the same talk more than once. It would take much more effort to create a new talk every time you give a talk.

I resisted this insight for years! It felt dishonest somehow, or like cheating. Like I’d learned this stuff already, so it’s unfair to pretend I’d just learned it a second time. But that’s thinking from the speaker’s perspective, not the audience’s. If your audience enjoyed the talk the first time, a completely different audience who’s never seen your talk or heard of you before is likely to enjoy the talk a second time. Even more likely, actually, since you’ll have more practice, know what to emphasize and what to gloss over, and just generally deliver a better talk. And in the unlikely event that the same person is at both events, they can tell from the title of your talk that it’s one they’ve heard before and decide not to go. And they won’t think it’s weird or cringe that you’re giving the same talk again.

I gave my first conference talk earlier this year. It was a talk that I’ve given in smaller venues at least five times before. No one complained.