As someone who has organized many meetups, there is always a real need for turnout estimates in my mind. Can you describe an example you have in mind where that’s not the case?

I would typically try to have some snacks and drinks, and wouldn’t want to be bringing either way too many or far too few. Also, I want everyone to be comfortable and have a positive experience, so if we have a concert hall for a meetup of 5 people, or a meeting room for a turnout of 100, plans need to change to give a quality experience for attendees.