@Cueball_AU when I started on committee 3 years ago, we also identified that problem. That year committee switched to using forum and it worked very well for us. All main committee discussions were moved from slack to forum. Discussions became written and async. Before that committee was relying on slack chats and meetings, so when I started there was close to none knowledge transferred and it took me 6 months to get up to speed.
We had these categories:
Docs & Guides
Documentation and guides to spread the knowledge and experience through the community.
Committee
Committee category is for work and topics which are related to committee of Ruby Australia. While committee also has private forum category which only them can see, not all discussion should be private and can benefit to be public.
Committee only
Private knowledge only visible to the current committee members
Meetings
This category is about meetings in Ruby Australia. Meeting minutes will be posted here after each meeting.