If the people there know that you stutter, there is no need to fear. They will expect you to take longer and no problem will happen. As a non stutterer, we give less shits (most of the time) about it than you would think. If you dont know the people, my advice is to tell them that you stutter beforehand, maybe explain to them that you stutter, and it will be fine. People arent evil, just a very small minority. And if you get bullied, you can say that you cant do shit about it, and bullying someone for something out of their control is outrageous enough most of the time that people will protect you. If you need advice or tips, DM me, I give lots of presentations and i have been asked to speak in public often. But the most important is to chill and recognise that no, we wont try to stab you to death through the computer if you happen to have a block.