You'd need a landing page where you can post details and get feedback. There are few discussions in the thread about open platforms, but I also started a commu

You'd need a landing page where you can post details and get feedback. There are few discussions in the thread about open platforms, but I also started a community on https://spectrum.chat/canada https://spectrum.chat/canada. I'm Toronto-Waterloo based. Let me know if you have any ideas. In my experience, if the groups is small enough but has sociable members, they will just agree on a time and half the expected number of people will show up. Even 5 people is a success IMO.