Makuhari Messe is the site of CEATEC JAPAN 2012 and it is readily accessible from both the Narita International Airport and Haneda Airport (Tokyo International Airport). Getting to Makuhari Messe takes about one hour by bus or train from Narita International Airport and from Haneda Airport. The recommended public transportation option for visitors from Narita International Airport is the Limousine Bus, as there are no transfers necessary.
Narita International Airport
Haneda Airport Express user guide(Keikyu Limousine)
Airport Express (Keisei Bus)
Tokyo Subway Map
Railway Transfer Guide