Usually big meetings to collect input on a presentation draft are an inefficient use of time. Conversations get side tracked, people make ambiguous comments, introverts who might have intelligent points to add do not speak up (and vice versa). For smaller comments, it is best to have them send to you by email.
There is one exception though: when the overall way to pitch the story is not clear, you have to discuss it with everybody present. Otherwise you end up going back and forth in numerous iterations with a fundamental re-write of the whole pitch. When you do run this kind of meeting, try to keep it focussed on that subject: the overall approach to the story, and not editing sentences and headlines on individual slides.