This year’s edition of Anime Expo 2011 was held at the Los Angeles Convention Center from July 1-4. Anime Expo is generally the celebration of all things Japanese, whether it be manga, anime, bad karaoke, or that awesome past time cosplay. The great thing about cosplay at AX is it's never limited to anime, so prepare yourself for comics, anime, video game, and movie costume goodness.
Sources: NightmareLuffy, PopCultureGeek