COSine Science Fiction Convention

January 18-20, 2019

Colorado Springs, Colorado

COSine 2019 is pleased to annouce our Guest of Honor
Carrie Vaughn

Our Science Guest, Professor of Astronomy
Dr. Mike Brotherton

Joining us again this year are Special Guests
Connie and Courtney Willis.

For the latest happenings, check here or our Facebook page.

  • The program schedule is now online. More details will be coming soon. Click here for the full listings.

  • Online registration is closed, but full memberships and day passes can be purchased at the door. Click here for the rates.

Want to attend?

COSine has a membership fee that includes all activities and games, Dealer's Room, Author's Reception & Signing, and our renowned Con Suite with food and drinks you can enjoy all weekend.


COSine is proud to feature Carrie Vaughn as our Guest of Honor for 2019. We are pleased to again welcome Connie and Courtney Willis as our Special Guests.


COSine 2019 will be returning to the same hotel we have used in the past, the Hotel Eleganté Conference & Event Center, located at the south end of Colorado Springs, just off I-25. The hotel has great function space for our convention, and the best view ever from the dealer's room!

Call for Volunteers!

Want to help out? We would love to have you! If you would like to lend a hand, contact the committee member in charge of any area you are interested in, or you can volunteer at the convention itself. You can come to meetings of First Friday Fandom to see how we organize the convention and share your opinions.