And don't forget, the business card should be received and given with both your thumbs pointing at him.
On receiving the card you need to "study" it and make muffled grunting noises to indicate how impressed you are with his status.
Check first with Leo whether or not your guest has spotted your white cane. If not, you can go through this charade. But if he has, then again, Leo will have to pick up the slack.
And if he insists on visiting your village, please let Leo do the driving.