C. H.
Diversify presenters
Diversify presenters - all white presenters do not have the lens and experiences necessary to see the world as all of our audience does. Possibly extend each session to about 90 minutes, or reduce number of files critiqued, so more discussion with context could be provided, rather than assumptions the graphics you select fit into the category you incorrectly put it in, making any critique less than helpful. Ask for clarifications from those submitting so the critique you offer is relevant and useful.