CIMG6520 A costumer with a triangular hat Posted onDecember 31, 2021December 31, 2021 ApolloCon 2007: Saturday: masquerade, hall costumes, and miscellaneous pictures 600 × 800 A costumer with a triangular hat at ApolloCon 2007 CIMG6520 A costumer with a triangular hat — possibly another piratoid costume — at ApolloCon 2007. ApolloCon used to be a speculative fiction convention in Houston, Texas.