I was just browsing through the list of events coming to Tokyo Big Sight during the time I'm in Japan, and freaked out that it was Tokyo Anime Fair :D
From Thursday March 27th until Sunday March 31st Tokyo International Anime Fair is held at Tokyo Big Sight in Odaiba, Tokyo. The first two days are for businesses and the last two days are for the public.
I will go at least one day, as I still had some free time to fill in.
I guess I'm gonna buy a second CF card for my camera for taking pictures ^^. I will sure put up a lot of pictures afterwards. Really looking forward to this!
Tokyo International Anime Fair Official Site