Heterodoxy in a religious sense means "any opinions or doctrines at variance with an official or orthodox position". Under this definition, heterodoxy is similar to unorthodoxy, while the adjective "heterodox" could be applied to a dissident. *
Camp - deliberately exaggerated and theatrical in style, typically for humorous effect. **
Halloween is a license to break with the orthodox and the everyday. Society opens up the public space to every manner of strange. Camp becomes a persona that is more than acceptable. Social rules evaporate and it is safe.