When and where is the Costume Contest presented by whom? FAN EXPO HQ September 19, 2017 17:21 Follow This fan favorite event has reached new heights! This year’s event will take place in Ballroom C on Saturday at 5PM EST. Related articles When is the costume contest at MEGACON Orlando? Can you tell me if my prop is allowed at MegaCon Orlando? Comments 0 comments Article is closed for comments.