I would highly recommend you to be open with your stutter just at the start of the presentation. I know this sounds scary as hell or even impossible in your mind now cause you hid it all year. But trust me it gets so much easier when you're open about it. People don't mind as much as you think. And my experience is that I'm way more fluent around people who know about my stutter. I wish you all the best for you presentation 💐