A good blindfold - perfectly opaque. A service desk. The blind person and companion approach a service desk where the attendant is busy writing. The service person gives them no eye contact and says nothing to them. Attendant continues to ask carer questions and carer stumbles through answers.
Blind person looks uncomfortable, asks carer the time, but carer has gone off, so no reply.
This activity should be fun. It illustrates the wrong way to interact with a blind person in a simple situation and leaves much scope for humour in acting it out. Open ended questions designed to highlight problems with this interaction. Run the role play again, this time doing everything correctly. Door to room left half open.