So Katsucon (February), Anime Boston (April), Otakon (late July/early August), and AWA (September). In the west coast you'll generally find the fans are clustered in certain areas. Norcal and Socal share some overlap regarding Fanime and Anime Expo (it's a pretty simple and not even that incredibly long of a drive), but the other major west coast anime con is in Seattle, which is mostly attended by the fans that live in the Oregon/Washington/British Columbia region.