COSine

A convention put on by First Friday Fandom in Colorado Springs, CO, since 2004. The name comes from COS (the Colorado Springs airport code).

Website.

Convention	Date	GoHs, Notes
COSine 2004	Jan 16-18, 2004	Barbara Hambly
COSine 2005	Jan 21-23, 2005	Joe Haldeman
COSine 2006	Jan 20-22, 2006	Sharon Lee, Steve Miller
COSine 2007	Jan 19-21, 2007	Connie Willis
COSine 2008	Feb 1-3, 2008	Mike Resnick
COSine 2009	Jan 23-25, 2009	George R. R. Martin
COSine 2010	Jan 22-24, 2010	L. E. Modesitt, Jr.
COSine 2011	Jan 21-23, 2011	Sharon Shinn
COSine 2012	Jan 27-29, 2012	Charles Stross
COSine 2013	Jan 25-27, 2013	S. M. Stirling, Connie Willis, Courtney Willis, Jordin Kare
no convention	2014
COSine 2015	January 23-25, 2015	Nathan Lowell, Wil McCarthy
COSine 2016	January 22-24, 2016	Jim Butcher
COSine 2017	January 20-22, 2017	Jo Walton
COSine 2018	January 19-21, 2018	Jody Lynn Nye
COSine 2019	January 18-20, 2019	Carrie Vaughn, Mike Brotherton, Connie & Courtney Willis
COSine 2020	January 17-19 2020	Eric Flint, Peri Charlifu, Connie & Courtney Willis
COSine 2021	January 29-21, 2021	C. J. Cherryh, Jane Fancher, Connie & Courtney Willis Canceled due to Covid-19
COSine 2022	January 14-16, 2022	C. J. Cherryh, Jane Fancher, Connie & Courtney Willis, Anthony Maltese
COSine 2023	January 20-22, 2023	Martha Wells, Louise Gunderson, James Gunderson, Kyle Crutcher
COSine 2024	January 19-21, 2024	Catherine Asaro, Steve Leininger, Jim Humble
COSine 2025	January 24-26, 2025	Lawrence Watt-Evans, Theresa Mather, Connie Willis, Courtney Willis

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Convention
	2004—

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