It's worthwhile to think about how you want to structure this. I think a social only group is possible, but unlikely to be succesful long term based on the longevity of other groups here. There is a lot of insight from the discussion on the second MMG thread here starting with @grundomatic's post.
viewtopic.php?p=296581#p296581
Further down @AH hammers on some insights from his experiences
AxelHeyst wrote: ↑Tue Dec 31, 2024 3:42 pmtl;dr of the below: I perceive a difference between idea/topic discussion groups and mastermind groups where the focus is to help individuals with their progress on projects. They are different kinds of things. I think expecting continuity and attendance loyalty out of a discussion group is unrealistic, wheras I think it's an emergent property of a 'real' MMG (focused on individuals and their projects). I suggest that discussion groups call themselves discussion groups and plan for short time horizons. If the properties of an MMG is desired, focus on the member's stories and challenges instead of topics.
This plays out in the history of MMGs and groups on the forum :
Active
-AH MMG: 4+ years. Biweekly meetings
-Fiction Writing MMG: ~2.5 years. Occasional meetings Mostly active on Discord
Former MMGs
-MMG #2 discussion group: ~2 years. Monthly(?) meetings
-EcologyMMG: 2 years. Biweekly meetings
-RepairCafe MMG: 1 year. Monthly Meetings
-Plotkin MMG: ~9 months. Unsure of meeting frequency
-Knot MMG: 2 meetings (Ongoing active signal chat)
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If you go for a more structured route (or even if you don't), I would highly encourage starting a group chat elsewhere, via Signal or something else. That's been the best aspect of my experience with MMGs. If the forum is a grad school environment, then the chats are an undergrad/high school environment where I can joke around, discuss personal issues I wouldn't share here, and talk about politically or philosphically sensitive topics (for the forum).