For a few years now web developers around the world have celebrated Saturnalia Christmas with advent calendars covering topics related to the web. I expect you will recognize some of these from prior years.
I may have missed some, so please pass them along if you know of not listed. As I learned in prior years where I have tracked them, I don’t know them all on December 1, and update accordingly. Some of this is because the sites don’t promote the new calendar on the home page.
UXmas is an advent calendar aimed at the user experience community. Coming from Australia, American readers may be thrown just a bit by the schedule. This year the organizers are experimenting with shorter content and different formats.
Performance Calendar hails this as the speed geek’s favorite time of the year, ostensibly because of the tips it has been offering each December since 2009. It isn’t just server optimizations you’ll find here, so don’t shy away because you’re not a system admin.
24 Pull Requests is less an advent calendar than it is an effort to mobilize developers. The goal is to get developers to send a pull request every day in December (up to Christmas), thereby supporting your favorite open source projects. There are even Coderwall badges for those who collect those sorts of things.
SysAdvent is aimed at systems administrators, but there is a some cross-over to web developers. It has posts dating back to 2008, so there is plenty of good material there if you’re too impatient to wait for each day to be revealed.
Advent of Code provides a small programming puzzle every day up to Christmas. They are stand-alone, but supposedly have a general theme. They also use different technologies so there is some variety as well.
24 Jours de Web is back (after skipping 2016) as an advent calendar for web folk. Written in French, it is clearly primarily targeted at French speakers, but a round of Google Translate will open it up to far more readers (like me).
The Content Strategy Advent Calendar is not a technical calendar but instead is focused on providing advice and tips on all things content related. Each day a new video will be revealed from a content strategy expert (this year it has closed captions, at least for day one).
Web Accessibility Advent Calendar 2017 is in Japanese, and thanks to the wonderful powers of Google Translate, I can tell you that anything form poems to posts count as long as they are about accessibility: Webアクセシビリティに関する内容であれば、ガチネタでもポエムでも構いません。). If you know Japanese, I welcome any corrections.
Perl Advent Calendar goes all the way back to 2000 (and back then looked a bit more like a traditional advent calendar, too) and has been dispensing tips for Perl developers ever since.
19. Perl 6 Advent Calendar
Perl 6 Advent Calendar is conveniently timed with the anniversary of the first release of the Perl 6 specification. It will post something the authors like about Perl 6 each day.
20. Happy Gridvent
Happy Gridvent appears to be both an experiment in grid and a collection of links to CSS grid articles, sites, and tutorials. They are all available now, so you do not have to wait a full month to check them out. Keyboard-only users may find it… tricky to use.
Christmas advert accessibility review is dedicated to examining the accessibility of popular Christmas video advertisements (such as TV commercials). It will examine them for captions, audio description, and so on.
22. GopherAcademy Advent
GopherAcademy Advent has been running since 2013. The posts in the calendar are all related to Go and were submitted from volunteers.
Data-driven Advent Calendar is bunch of tutorials, interviews, games, and other contributions. It is produced by Journocode, a collection of journalists and computer scientists working in newsrooms across Germany. Thanks to Jens in the comments for this one.
24. Digital Self Defense
Digital self-defense by Digital Courage is an advent calendar dedicated to provide a daily nugget to help you take a step closer to protecting yourself online and freeing you from invasive services.
React.christmas is new to me, thanks to SirGobblins in the comments. Each day it will post an interesting nugget, tip, or trick about ReactJS. I didn’t even realize .christmas was a gTLD, so I learned something new.
The Economist is running a daily chart advent calendar. While it is not about the web, it is deployed on the web and it has interesting and current stories and background for each of the charts.
I started tracking these in 2010. Since then some have come and gone. For the ones not returning, in many cases the content is still out there. Take a look and maybe you’ll find an older article that is useful today.