The annual offline meet-up, at which display booths and stages are aired live online for those who can’t make it in person, last year drew about 125,000 visitors, with some 7.6 million viewers logged on to watch through the Internet, the organiser said.
Among the newcomers this year was a squad of Pepper androids.
An interactive Pepper, developed by French robot-maker Aldebaran, was unveiled last year and has already received customers at scores of Japanese stores of mobile carrier Softbank.
But at the cultural festival, several Peppers sang and danced together in a band.
Next to the stage, another Pepper was dressed as a Japanese Shinto priest, meeting with visitors who bowed before the android.
The event held at the Makuhari convention hall in Chiba, near Tokyo, also starred a 10-metre (30-foot) mobile suit robot called “Patlabor”, shortened from patrol labour.
It features in an upcoming Japanese sci-fi movie, in which the machine battles as part of Tokyo’s police force