Mega Disney Convention: D23 Expo in Anaheim

But this parade of inventive costume tributes isn't just something you'd come across at Comic-Con International in San Diego, if that was your first thought, understandably. Cue mystical music: Every two years, when the clock strikes midnight and the bluebirds trill and the mice hum and the wishing well begins to glitter, another major fan-focused convention shimmers into existence, in the middle of July, in Southern California.