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You mean a subforum?

It could work, but it could be hard to include details like join requirements. If you put that sort of stuff in for each group entry, the list will be too long and no one will want to read it all.. If you don't include enough details, no one will want to click on all the links to find out whether or not they're eligible to join each group..

I don't see this working out. :/

where is group open?