Anime Convention in Tokyo

Will there be any upcoming anime/manga conventions in Tokyo? I need to go for fieldwork. If not, any other suggestions? Like a museum. I don't want to go to Ghibli or Akihabara (unless there's an exhibit there). I need to look at general anime/manga and the fans.

The huge one each year is the last weekend in March at Big Sight. http://www.tokyoanime.jp/en/index.php

Anime events in Japan are so subdivided into dojinshi markets, seiyu
etalks, concerts, staff discussion, cosplay etc. There's no equivalent
of American style "anime conventions".

Major upcoming events:
5/3 Dream Party http://www.dreamparty.jp/ (adult game oriented)
5/3-4 Super Comic City http://www.akaboo.jp/comiccity/
5/4 Akiba Otaku Matsuri http://www.kyoshin.net/event/
6/28 Rondo Robe 2008 http://www.geneon-ent.co.jp/rondorobe/rr2008/ (reserved ticket required)
8/15-17 Comic Market http://www.comiket.co.jp/
8/16-17 TBS Anime Festa http://www.tbs.co.jp/anime/festa/ (reserved ticket required)
8/30-31 Chara Hobby 2008 http://www.chara-hobby.com/

for all the links.
unfortunately the march even is a little inconvenient since it's already May...

Also, class ends in July so I would need conventions/gatherings before that. I'm thinking about otaku matsuri. Thanks!