OSAKA INFO: http://www.osaka-info.jp/en/
From Kansai International Airport
About 1hour to the venue by train or bus.
Directions from the airport to the venue (Google Maps)
From Narita International Airport
The visitors from the certain countries/regions and under its certain conditions, VISA is not required for the short-term stay in Japan (68 countries/regions as of August 13, 2017).
Additional information: http://www.mofa.go.jp/j_info/visit/visa/short/novisa.html