We had dinner in the tatami room of the ryokan.
geisha party; dinner with geisha entertainment
Refers to a banquet or party held in a tatami room with geisha or maiko attending. Strongly associated with traditional entertainment districts.
See also: 座敷
I'd like to experience a geisha party in Kyoto.
geisha entertainment; being entertained by geisha
Polite form of 座敷 (zashiki, 'tatami room'), with the honorific prefix お. The second sense extends from the room to the event held there.