At Comike 83 au decides to mobilize "human Wi-Fi SPOT" as an in-vehicle base station, SOFTBANK also plans to set a mobile base station car or SoftBank Wi-Fi spot

Au has set up a special site and announces "Please use au Wi-Fi SPOT at comic market 83!"

Comic Market 83 | Event Countermeasures | Freedom to Connect. | Au
http://www.au.kddi.com/jiyu/network/event/comic83/index.html

The following are available areas within Tokyo Big Sight.


The in-vehicle base station that arrived at the last Comike 82 is


And this is "Human Wi-Fi SPOT", it will be down the venue


Also, SOFTBANK MOBILE offers similar announcements.

About area measures for events in December 2012 | SOFTBANK MOBILE
http://mb.softbank.jp/mb/news/contents/201211191611230000/index.html