Costume-Con: CC37 NEW! Costume-Con 37 was held March 22-25, 2019, in Danvers, Massachusetts. The theme was "Witches, Wizards, and Warlocks." Costume-Con 37 Fantasy and Science Fiction Masquerade Costume-Con 37 Historical Masquerade Costume-Con 37 Competitions and Exhibits Costume-Con 37 Committee