I had to present to 30 strangers the other day and I was stressed about it. I practiced my presentation about 15 times.  In the end it went fine. I said I had a stutter at the beginning, I took a few deep breaths and made sure to pause to sip a drink from time to time to take off some pressure. I stuttered but it was OK. I got questions at the end which hinted that people were engaged. I would just say that if you stutter, tell people. It will take some of the pressure off. Your goal is to impart knowledge. Stuttering a bunch doesnt really matter if you get your points across. The more you do it, the better you will be. I would also encourage you to watch others present. There are going to be a bunch of people who are super nervous or present poorly. Public speaking is challenging to people regardless of if they have a stutter. It is perfectly normal to be nervous and find this difficult.