MUCH ADO ABOUT NOTHING
Due to difficulties with writing, typing, and drawing this is an abstract presentation of concept to convey my ideas the best I can.
The main element of the lobby display I have focused on is a map of "who's who" -- and what their relationships are.
LOBBY DISPLAY
THE BASICS
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Conceptually, I would use a relatively simple mechanism, Pepe Silvia style. - 
Headshots of the actors with the name of their character would be arranged on a wall, and connected with different color yarn to other characters. Each color of the yarn would depict a different relationship, and a key would be provided, as well as the relationships listed beneath each character. 
 
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Below is a drawn example for Romeo and Juliet. Unfortunately I am unable to draw something similar (preferably a MUCH neater) for Much Ado. 
The RSC has a similar interactive map here.

EXAMPLES
BEATRICE

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Cousin to Hero/Friend to Hero 
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Niece to Leonato and Innogen 
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Potential love interest to Benedick 
BENEDICK
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Friend to Claudio 
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Friend to Don Pedro 
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Potential Love interest to Beatrice 
