Take the “AONAMI Line” at Nagoya Station and get off at the terminal （Kinjyo-Futo Station）. （It takes 24 minutes and costs ¥350.） From there, you can reach Port Messe Nagoya (exhibition site)within a few minutes on foot.
In addition, a shuttle bus service is available every 20 minutes between “Minato Kuyakusho” Station and Port Messe Nagoya, costing ¥100.

Port Messe Nagoya, whose formal name is Nagoya International Exhibition Hall, is the largest convention center in central Japan, boasting a 34,000 sq meter display area. It is located right at the entrance to the Port of Nagoya, the main gateway to Japan’s manufacturing sector.
(http://www.u-net.city.nagoya.jp/pmn/English/establish.html)