Originally , the show was held twice a year , once in the spring and once in the autumn ( in the Tokyo Big Sight ) starting in 1997 .
This format was discontinued in 2002 when the show was held only in the autumn .
Originally , the show was held twice a year , once in the spring and once in the autumn ( in the Tokyo Big Sight ) starting in 1997 , but this format was discontinued in 2002 when the show was held only in the autumn .