First to comment. I find group settings to be the perfect training ground for your stutter. It forces you to project your voice. To have to come to terms with having to show and talk with confidence. Lastly any embarrassments can be shrugged off as just a little mishap. Use the anxiety it gives you to make you numb to that fact that you are presenting in a group and learn to be more confident. To do this first and foremost you HAVE to mere second away find inside yourself all the confidence that is needed to make a good group presentation and present it to the people. Fake it if you have to at first but make sure you DO it, first step start out confident and project yourself and don’t forget to smile while you are doing it. While you are presenting negate the fact that you stutter, minimize it, keep a positive tone and again smile, practically focus merely on the topic and the crowd. It’s hard at first and you will mess up. The trick is to view each experience of you actually getting up and presenting a win because let’s face it, getting in front of a group is nerve racking even for nonstutterers. The one trick I can say will help out the most is, before going in front of the crowd, constantly psyche yourself out, tell yourself “you want this, this is good, I won’t fail, I want to do this, I NEED THIS” and put the rest to action. Trust me man. I stutter and this helped me out in group settings when I had to at least introduce myself in front of people. Also the easy part is before you present introduce your stutter and just like how you minimize it before you go in front of them, when introducing it minimize it. Make it seem like it will go away soon and that you love going in front of people in spite of it.