Special interest subgroups are a way for people with kindred interests to find each other, meet, collaborate, and have more in-depth discussions beyond those in the main roundtable. You’ll have your own dedicated forum and discussion.
Seek out and join one or more. Start up a group yourself, invite others, and promote it through the main forum. Search member profiles by keywords to identify those you wish to invite. Schedules subgroup meetings that do not conflict with Roundtable Wednesdays. Here is a short training video.