The presenter’s job is not to present a slideshow of ideas, or to sell the team on their work. Presenters are each given a 15–30 minute block of time they can establish a day in advance with the critique facilitator (more on that role in a second).
Four Things Working at Facebook Has Taught Me About Design Critique
Tanner Christensen

Another thing that I have found helpful is to share the designs a day or two before the session with the understanding that all feedback is held until the critique session. This gives the team time to think on the design and come up with insights/questions.

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