There is no indication of radiation higher than usual value except in Fukushima and Ibaragi prefecture.
Every food is controlled against radiation.
Then the safety is guaranteed for this problem.
In the website of Ministry of Education, Culture, Sports, Science and Technology(MEXT), http://radioactivity.mext.go.jp/en/
You can find daily data by prefecture on Environmental radioactive level Radioactivity level in drinking water Radioactive level in fallout And Reference on radiation in Daily life According to these information, Niigata, Tokyo and other prefecture except in Fukushima is safe.
In this English website, you can find also the same information in Chinese and Korean.
Toki Messe;
Niigata Convention Center
6-1 Bandaijima, Chuo-ku, Niigata 950-0078, Japan
tel.+81-25-246-8400
fax.+81-25-246-8411
http://www.tokimesse.com/english/
ACCESS TO NIIGATA, JAPAN
Direct Flights to Niigata : There are some direct flights from foreign cities such
as Shanghai, Harbin and Seoul.
ACCESS TO TOKI MESSE
Niigata Airport to Toki Messe
Taxi: approx. 20 min
Bus: approx. 35 min
Please note that there are no direct public transportation available
from Niigata Airport to Toki Messe. Please see below for detail.
From Niigata Airport to Niigata station:
There are limousine buses available to Niigata station. Please see the
following link for detail.
From Niigata station:
There are public transportations (bus) available to Toki Messe (run by
Niigata Kotsu). The bus station is located at 'Bandai exit' (North
exit). Take the line #17 (bound to Sado-Kisen, departing from the bus
stop #5) and get off at Toki Messe stop.