I will be all week-end (6 - 10 August 2009) at the 67th WorldCon, Anticipation, which held at the Palais des Congrès in Montreal.
There are lots of anime & manga related panels, as well as panels on electronic edition, Quebec Science-Fiction, and tons of other interesting subjects. There are also many famous writers attending the convention (Neil Gaiman, Charles Stross, Robert Silverberg, etc.). The entrance fee is quite pricy but I am sure it is well worth the experience.
This calendar gives you an idea of the activities I am planning to attend. There are so many panels that I will have some serious choices to make!