I think 100 attendees isn't a horrible thing if they actually feel a sense of common ground. The real difficulty is eliminating the friction that exists between people in those large gatherings. Something we try really hard to accomplish, in between all the tea times we host, is create larger gatherings for the community and cities at large that welcome people in a way that gets rid of all notions that any attendee would need formalities to treat the others like the most amazing person in the room.
