I do presentations on a regular basis. When I feel like I'm too anxious just to power through, I put one bullet point on stuttering on one of the first slides that covers my background. It usually says something like "- normalizing disabilty: It's not a brain freeze, I stutter" this way everybody will know about how they can interpret my blocks. And framing it as normalizing disabilty will give it an even more positive twist: people in the audience with some form of disabilty will connect to you, others will support your message. When I talk through this point I try to make it sound like something I care about, but that it (the stuttering) is not roo big of a deal. I'm trying to have a "hey guys just trying ro let you know" kind of attitude. Because for most people listening, it's not a big deal anyways. That's also why I put the "joke" in with the brain freeze. People will not feel uncomfortable about your stutter, if you don't. And to symbolize it all I put the stutter pride flag next to my bullet point. So far being upfront about it, I made very very good experiences with it, feeling more connected to the audience. Good luck with your presentation! :)