The 2021 Roundup of Advent Calendars for Designers and Developers
Tags: adventcalendar, roundup, news
Published: 2021-12-06 07:48:47

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. There are a few great new appearances. And, unfortunately, some calendars are not running this year either.

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![12 Days of Web](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/92oad7357p3zwpmi9pz6.jpg)

## 12 Days of Web

This is a year-end celebration of fundamental web technologies: HTML, CSS, and JavaScript, run by [Stephanie Eckles](https://twitter.com/5t3ph).

- [12daysofweb.dev](https://12daysofweb.dev/)

***

![24 Days in December](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/yqvir3uist4ve567v7zo.jpg)

## 24 Days in December

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

- [24 Days in December](https://24daysindecember.net/)

***

![24 Days in Umbraco](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/9eyj2r9p10y9gy6mn8qy.jpg)

## 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 in Umbraco](https://24days.in/umbraco-cms/2021/)

***

![24 days of #JavaScriptmasn](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/o4bmz93qdsh1pet3mt5y.jpg)

## 24 days of #JavaScriptmas

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

- [24 days of #JavaScriptmas](https://scrimba.com/learn/javascriptmas2021/)

***

![24 jours de web](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/3xxryaz102sqpj8yhs4p.jpg)

## 24 jours de web [French]

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

- [24 jours de web](https://www.24joursdeweb.fr/)

***

![24 Pull Requests](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/34z76cdqxzt2q5e8fb9s.jpg)

## 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.

- [24 Pull Requests](https://24pullrequests.com/)

***

![AdventJS](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/dhl2zlzo7asev4kamoga.jpg)

## AdventJS [Spanish]

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

- [adventjs.dev](https://adventjs.dev/)

***

![Advent of Code](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/5ah5hluw40fyklhenci7.jpg)

## 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 Code 2021](https://adventofcode.com/2021)

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![Advent of CSS](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/emj001jdz124z61dx92o.jpg)

## Advent of CSS

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

- [adventofcss.com](https://www.adventofcss.com/)

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![Advent of Cyber](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/oaa40kwpr2vfzt5g433p.jpg)

## 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 Cyber 2021](https://tryhackme.com/room/adventofcyber3)

***

![Advent of JavaScript](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/a5ourmtqi40yskzi18d6.jpg)

## Advent of JavaScript

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

- [adventofjs.com](https://www.adventofjs.com/)

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![Bekk Christmas](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/r9tmhyt87sf5188q8da7.jpg)

## Bekk Christmas

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

- [Bekk Christmas](https://www.bekk.christmas/)

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![C# Advent Calendar](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/kxsv0dbyx562cfl7n7ro.jpg)

## 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

- [C# Advent Calendar 2021](https://www.csadvent.christmas/)

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![Code Security Advent Calendar](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/v4ro2ysqu3i6bs6szzpx.jpg)

## 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.

- [Code Security Advent Calendar 2021](https://blog.sonarsource.com/code-security-advent-calendar-2021)

***

![CSS Tricks](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/csv06z0aliej69502zup.jpg)

## 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.

- [CSS Tricks 2021 End of Year Thoughts](https://css-tricks.com/category/2021-end-of-year-thoughts/)

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![Designcember](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/0zo6dcve7gqpydtmoasd.jpg)

## Designcember

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

- [Designcember](https://designcember.com/)

***

![F# Advent Calendar in English](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/mzumz03q6i7fxz5l6jxn.jpg)

## 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#.

- [F# Advent Calendar in English 2021](https://sergeytihon.com/2021/10/18/f-advent-calendar-2021/)

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![Festive Tech Calendar](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/bjzqkoaocvkbtu8c3f8q.jpg)

## Festive Tech Calendar 2021

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

- [Festive Tech Calendar 2021](https://festivetechcalendar.com/)

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![HTMHell Advent Calendar](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/44hmrgn7o45k8l4rg58u.jpg)

## HTMHell Advent Calendar

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

- [HTMHell Advent Calendar](https://www.htmhell.dev/adventcalendar/)

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![IT Security Advent Calendar](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/3k9lgq883bf58atdo0o5.jpg)

## IT Security Advent Calendar

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

- [IT Security Advent Calendar](https://www.infowebica.com/resources/security-advent-calendar/)

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![JVM Advent](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/t4oode92xcwnq6ujez71.jpg)

## 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.

- [The JVM Programming Advent Calendar](https://www.javaadvent.com/)

***

![Knowit Kodekalender](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/r87k27qf80rq5pf7iod7.jpg)

## Knowit Kodekalender 2021 [Norwegian]

Knowit is back again with a calendar for Norwegian developers.

- [https://julekalender.knowit.no/](https://julekalender.knowit.no/)

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![Lean UXmas 2021](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/di8inmlafwg1zbjnmz5k.jpg)

## Lean UXmas 2021

Explore the most interesting Agile and LeanUX articles of 2021

- [https://2021.leanuxmas.com/](https://2021.leanuxmas.com/)

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![Perl 6/Raku Advent Calendar](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/otu8e6hjz5xu7pl9nyps.jpg)

## 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.

- [Perl 6/Raku Advent Calendar](https://raku-advent.blog/category/2021/)

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![Qiita Advent Calendars 2021 - Japanese](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/t3uex0uldnrvuycjgfdc.jpg)

## Qiita Advent Calendars 2021 [Japanese]

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

- [Qiita Advent Calendar 2021](https://qiita.com/advent-calendar/2021)

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![SELFHTML Advent Calendar](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/hzvhc7b1oty487oj810c.jpg)

## SELFHTML Advent Calendar 2021

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

- [SELFHTML Advent Calendar 2021](https://forum.selfhtml.org/advent/2021)

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![SysAdvent](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/ddyj6rwl1r59qnxt5ikh.jpg)

## SysAdvent

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

- [sysadvent.blogspot.com](https://sysadvent.blogspot.com/)

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![Web Performance Calendar](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/b4wmn01iewnnwox3k836.jpg)

## 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.

- [Web Performance Calendar](https://calendar.perfplanet.com/2021/)

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## 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

- [24a11y.com](http://www.24a11y.com/)

### 24 Ways

- [24 Ways](https://24ways.org/)

### 25 Days of Ruby Gems

- [25 Days of Ruby Gems](https://planetruby.github.io/gems/)

### Perl Advent Calendar

- [Perl Advent Calendar](https://perladvent.org/2020/)

### PWAdvent

- [PWAdvent](https://pwadvent.dev/)

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## 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 issue](https://frontendnexus.com/articles/advent-calendar-roundup-2021/) on social media, and follow me on [Twitter](https://twitter.com/frontendnexus). 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](https://pixabay.com/users/geralt-9301/?utm_source=link-attribution&amp;utm_medium=referral&amp;utm_campaign=image&amp;utm_content=1742106) from [Pixabay](https://pixabay.com/?utm_source=link-attribution&amp;utm_medium=referral&amp;utm_campaign=image&amp;utm_content=1742106)