It is very difficult as a stutterer for sure to add your input to groups when everyone else is talking really quickly without blocking up that you almost feel intimidated or envious of them having a lot more to say than you, or you're very fearful of stuttering with a huge block of so many eyes looking at you that you decide to yourself that staying silent is a better option to avoid embarrassment but at the end, if you're like me, you tend to overthink if you were being too reserved or boring. It's honestly a double-edged sword here! Group conversations should be relaxing and inclusive, not competitive and stressful. As someone who runs book clubs, I always let members know over group messages beforehand that I stutter so it takes some pressure off me and so they can subconsciously show me a bit more patience in doing so. I establish clear boundaries and rules of wanting an inclusive experience of everybody around the table/circle to have something to add in. Thankfully I've had sweet experiences of meeting empathetic individuals whom I've seen to include quieter members to have a say. I think volume, hand gestures and maintaining eye contact are the signals to try to show group members that you are also about to say something. If there's a brief silence, quickly jump in or start off with a loud "Sooo" or something to attract attention. Easier said than done but try not to feel penalised or forced in speaking too fast. Take your time. If you stutter, don't worry too much about it, the real ones will still stick around with you. I would say to avoid loud settings that's blasting heavy music in the background so you're not as drowned out. If all fails, politely tell a few of them how you feel. Have some practice with smaller groups to boost your confidence such as with 3 people, then move onto 5 people, then 7 people, etc. to gradually get used to it and what kind of people are right for YOU.