I've only done this a few times, but I would recommend instead of getting all wrapped up in the technical details, be yourself. Talk about your experiences. Have the audience ask you questions. Use show and tell - bring in your charge cable, show photos on a projector, take people out to your car (if you can). Invite others with EVs (NJ has a great group on FB - https://www.facebook.com/groups/njeaa/) Explain how long things take, how much money is spent on electricity, using simple terms that people can understand.