Your decision not to provide a bouncy castle was sensible. It would be best to leave it for a larger ground level venue.

[ It's all too easy to imagine the described consequences of a bouncy surface used recklessly on a rooftop. It's also likely that no one feels that the party is missing a vital element without the inclusion of a bouncy castle. ]

With regard to eggplants, yes, the color is pleasing, as is the taste. They are reasonably versatile.