The 2021 Roundup of Advent Calendars for Designers and Developers | Front End Nexus

The 2021 Roundup of Advent Calendars for Designers and Developers

It's advent calendar season again. Keeping up with the (one-year-old) tradition, I'm bringing you a roundup of calendars focused on the design and development industry.

Most of the entries are long-lasting participants (listed in alphabetical order). There are a few great new appearances. And, unfortunately, some calendars are not running this year either.

12 Days of Web banner

12 Days of Web

This is a year-end celebration of fundamental web technologies: HTML, CSS, and JavaScript, run by Stephanie Eckles.

24 Days in December banner

24 Days in December

This is the 6th edition of the calendar where the PHP community shares their stories.

24 Days in Umbraco banner

24 Days in Umbraco

Umbraco CMS is a tool for building multilingual sites. They've been running an advent calendar since 2012 and are still going strong this year as well.

24 days of JavaScriptmas banner

24 days of #JavaScriptmas

Level up your JavaScript skills with a daily coding challenge from December 1st to 24th.

24 jours de web banner

24 jours de web [French]

Le calendrier de l'avent des gens qui font le web d'après.

24 Pull Requests banner

24 Pull Requests

This is a yearly initiative to encourage contributors around the world to send 24 pull requests between December 1st and December 24th.

AdventJS banner

AdventJS [Spanish]

This is a challenge-based event for developers speaking Spanish.

Advent of Code banner

Advent of Code

Advent of Code is an Advent calendar of small programming puzzles for a variety of skill sets and skill levels that can be solved in any programming language you like.

Advent of CSS banner

Advent of CSS

This is a challenge event, where you receive a new CSS challenge every day until Christmas.

Advent of Cyber banner

Advent of Cyber 2021

Get started with Cyber Security in 25 days with TryHackMe's FREE Christmas event! Learn the basics of cyber security by doing a new, beginner-friendly security exercise every day leading up to Christmas

Advent of JavaScript banner

Advent of JavaScript

This is similar to the Advent of CSS event presented above, only it is focused on JavaScript challenges.

Bekk Christmas banner

Bekk Christmas

Last year, Bekk did 11 calendars. This year they are concentrating everything on one event, with multiple entries

C Sharp Advent banner

C# Advent Calendar 2021

Starting on December 1st, the C# Advent will reveal TWO new C# blog posts every day up to and including December 25th

Code Security Advent banner

Code Security Advent Calendar 2021

Are you a code security expert? Every day, there will be a code security puzzle announced on Twitter to which you’re welcome to join and share with your friends to discuss solutions together.

CSS Tricks 2021 End of Year Thoughts banner

CSS Tricks 2021 End of Year Thoughts

This is not a "by-the-book" advent calendar, but a special category where they ask fellow web creators how can people make their websites better. Definitely worth reading, just as all the other calendars in this list.

Designcember banner


This is a month-long celebration of web design, brought to you by the team. Every day they release a new piece of UI development-related content to celebrate the flexible and fluid new responsive web of tomorrow.

F Sharp Advent Calendar in English banner

F# Advent Calendar in English 2021

F# Advent Calendar is a long tradition in the F# community. Christmas is approaching again, and now is the time to prepare our spirit for it with the goodness of F#.

Festive Tech Calendar banner

Festive Tech Calendar 2021

This year the Festive Tech Calendar Team is raising money for the charity @girlswhocode.

HTMHell Advent Calendar banner

HTMHell Advent Calendar

HTMLHell is a very interesting site to explore. And this year they bring an advent calendar as well.

IT Security Advent Calendar banner

IT Security Advent Calendar

Every day is a new tip to stay on top with the protection of your devices, networks, and data.

JVM Advent banner

JVM Advent

Java Advent is here to make that advent season even sweeter for JVM enthusiasts. The advent season is the days before the festive season, so December 1st until December 24th. Each day you will find a new article about JVM-related topics.

Knowit Kodekalender banner

Knowit Kodekalender 2021 [Norwegian]

Knowit is back again with a calendar for Norwegian developers.

Lean UXmas banner

Lean UXmas 2021

Explore the most interesting Agile and LeanUX articles of 2021

Perl 6/Raku Advent Calendar banner

Perl 6/Raku Advent Calendar

This calendar has been around for 13 years. This year they continue to bring advent posts with the best, the nicest, and the merely possible in the Raku realm.

Qiita Advent Calendars banner

Qiita Advent Calendars 2021 [Japanese]

Qiita is a Japanese portal for developers and they are hosting a lot of advent calendars this year.

SELFHTML Advent Calendar banner

SELFHTML Advent Calendar 2021

SELFHTML is a great community for German-speaking developers. This year the calendar is dedicated to accessibility

SysAdvent banner


This calendar aims to provide great articles about systems administration topics written by fellow sysadmins.

Web Performance Calendar banner

Web Performance Calendar

"The speed geek's favorite time of year" is back. The Web Performance Calendar once more brings us much-needed advice on how to make our websites faster.

Calendars not running in 2021

Once more some well-established calendars are not present this year. Some have announced they are taking a break this year, while others have just stayed silent. Most of the content there is still valuable, so you might want to have a look.

24 Accessibility

24 Ways

25 Days of Ruby Gems

Perl Advent Calendar


Wrapping things up

That's all there is for this year. If you enjoyed this roundup, there are a couple of ways to support it. You can share the link to this article on social media, and follow me on Twitter. Each one of these helps me out, and I would appreciate your consideration.

Have a great and productive winter holiday season, keep yourselves safe, and I will see you around!

Happy Tech Advent!

Credits: Main banner image by Gerd Altmann from Pixabay

Join the Front End News family

Receive the latest #FrontEndNews straight in your inbox, every Monday.

No spam, ever! Your email won't be shared with anyone else and you can opt-out at any time.