Comparing wig shades under stage lights

I am putting together a short community workshop about comparing hair shades, and I want the exercise to stay practical. We will use paper swatches and a mirror. Nobody will be applying color during the session. One participant asked about cool summer hair colors and I thought that could be a useful example of how people narrow a search. I would show several browns rather than one ideal shade. Each label would mention warmth and depth. We could then discuss why two similar names may look different on different screens or printed cards. Personal preference needs space in the discussion. I would treat a quiz as an opening prompt. It would not become a salon formula. What simple demonstration would you suggest? I especially want participants to leave with useful questions for a colorist instead of a promise that one shade must suit everyone.