for example if you go to https://wiki.mozilla.org/Test_Pilot#Come_to_our_meetings.21 and look at the screenshots events, they are in their own screenshots room. I didn’t find the public link for this room anywhere in the page
Each project decides on their own (and sometimes changes their mind). It often depends on how many people are working on it and as people move on to other things the meetings adjust. I’ll ask the team to add a link to the meeting invite or remove it from the calendar. Cheers
Edit: updated to clarify invite vs wiki