Shonen Jump Festival ( Jump Festa )
Jump Festa is an awesome free entry anime/manga/ gaming convention where you can see the latest stuff coming out. It is usually held at the end of December in the Makuhari Messe, which is close to Tokyo Disney. It is a whirlwind of amazing events. Jump Festa is difficult to attend if you do not know Japanese or the system. Like if you wanted to test out a game that is not out yet then be sure to get a ticket before they run out. Also the line to get in is pretty long, but time passes by quick especially with all the cool cosplayers around. If you are a fan of what they showcase then I recommend going here because it is free to enter and there are some free stuff you can get.