Henry Dienn just informed me about the dates of the upcoming 2017 (35th) 'Tokyo International Audio Show' (TIAS for short)
29th September 10.00 - 19.00
30th September 10.00 - 19.00
1st October 10.00 - 17.00
Entrance is free. The only requirement is filling out a registration card. The show is held at the 'Tokyo International Forum', located in Yurakucho, Tokyo.
Website link in English: http://iasj.info/