The ebook shop I'm talking about could also have "theme days," e.g. Monday is Science Fiction & Fantasy, and the default displays would feature prominent SF&F books and art, and maybe there would be a roleplaying game or
Starfleet Battles (or
Cosmic Encounter) going on at one of the tables. Tuesdays we'd do history and historical fiction, with appropriate music, and a discount on your beverage if you come in wearing period clothing.

It's easy to theme the whole shop if your displays are electronic.
Maybe after I get tenure.