For the first time ever at Colossalcon Prime, we’re opening the doors to the Underground Market District (18+)! A one-night-only, Thursday evening marketplace dedicated to mature art, manga, figures, and more. This late-night experience brings together artists, dealers, and attendees in a fast-paced, curated space built for buying, selling, and exploring content in an 18+ space. Whether you're hunting for something unique or setting up your own table, this is your chance to be part of something new!

To participate, you’ll need a valid badge and 18+ wristband/ID. Tables are first-come, first-served with check-in at Events 1, and all merchandise will be vetted before the market opens. Space is limited, so placement is assigned based on line order. Bring your best work, come prepared, and don’t miss your shot at Colossalcon’s most underground experience yet.