COSine 2025 Status Report #1 – March 9th, 2024

COSine 2025 will be January 24-26, 2025 at the Embassy Suites by Hilton Colorado Springs. Tonight is Spring Forward Night, for all who celebrate. It seems like COSine 2024 just happened, and now we are talking about COSine 2025! Someone seems to be stealing time and running off with it. Tempus fugitive. But we do … Read more

COSine 2024 Status Report #1

COSine 2024 will be January 19-21, 2024 at the Embassy Suites by Hilton Colorado Springs. Normally we like to announce our guests for the following year at the end of each convention. Well, we are only off by about six months this time, so not too bad! Okay, yes, it is pretty bad–but there were reasons, … Read more

COSine 2023 Status Report #4

It is barely two weeks to go until Penguin Awareness Day, followed quickly by National Cheesy Socks Day and the Lunar New Year, commencing the Year of the Rabbit. Oh, and it’s also less than two weeks to go until COSine 2023! COSine 2023, January 20-22, 2023, at The Embassy Suites by Hilton (Woodmen and … Read more

COSine 2023 Status Report #3

In just over a month, people will be converging on Colorado Springs from all over the known universe (even that weird-shaped rock they just crashed a rocket into), and we very much hope that you will be amongst them! In case you missed the last status report, COSine 2023 will be held on January 20-22, … Read more

COSine 2023 Status Report #2

COSine 2023 is rapidly approaching—only 3 months away (yikes!). And, approaching even faster is October 31st, which is not only Halloween but, even scarier, is the last day to get reduced-rate tickets to the convention! You can sign up for tickets here. In case you missed the last status report, COSine 2023 will be held … Read more

Eric Flint Passed Away

We just heard the sad news that Eric Flint, our COSine 2020 Guest-of-Honor, has passed away. Eric was best known for his novel 1632 and the alternate history series it inspired. As a guest, he was lovely and generous (despite a reputation for gruffness that seems undeserved). He was also well known for inspiring and … Read more

COSine 2023 Status Report #1

At the end of 2021 we weren’t sure if there was even going to be a COSine 2022, much less a COSine 2023. For those who don’t know, on December 30th, 2021 the Hotel Eleganté was purchased and decided to no longer hold conventions! Fortunately, after a bit of bargaining, COSine 2022 went ahead and … Read more

Hotel Link Fixed

Thanks to everyone who pointed out that the hotel info was still set for 2021. It is now fixed. You can sign up here for the special convention rate of $99/night.


We’ve had a few people contact us looking for roommates for the con, so we’ve set up an e-mail address: If you are are looking for a roomie, just send an e-mail to that address with some basic info: Days you will be staying Gender Contact info Anything else a potential roomie should know … Read more

Participants page is up!

It’s taken a while, but the Participants page is now up! Part of the delay was that we just have so many great participants signed up for COSine 2020! (And, of course, was in no way related to yours truly getting distracted by other shiny things). This list is also not final – we are … Read more