Several rituals are performed in the movie which are very intriguing, specially preparing Kaguya hime to be presented to nobility, and how the host invites the whole land for a 3 day feast, where nobody sees Kaguya, but she sits in a room for 3 days straight.
There are several other instances in the movie that show some very interesting customs of the time. I would be very interested in knowing what age this is in, and if there are other films/documentaries that depict this, or if there's any good reading to do about it.
Thank you very much!
What is the time period shown in the film? Is the film supposed to be based on history, or is it a fantasy film? More information is needed.
I haven't seen the movie, but Kaguya Hime is a Heian period folktale and the image you linked to matches that aesthetic.
It's fifty years old, but I'm still going to recommend Ivan Morris' The World of the Shining Prince: Court Life in Ancient Japan as an introduction to the culture and customs of the period.