[Callers] Calling for the visually impaired

I work with the visually impaired and have been asked to call an evening of dances for an outing. I know the basics of working with the visually impaired but does anyone have any suggestions for dances, how to handle the directional aspect, or any other ideas to make it a successful experience. I hope that each visually impaired dancer will have a "seeing" partner. Thank you so much in advance. Helle