Advent and Holiday Calendars 2023

Here are some advent and holiday calendars for 2023:

Web Performance Calendar – The speed geek’s favorite time of the year

Advent of Code 2023

Perl Advent Calendar 2023

Lean UXmas 2023 – The top articles from 2022’s Agile & Lean UX News

It's a Shape Christmas | Digital Advent Calendar

There is one in French:

24 jours de web : Le calendrier de l'avent des gens qui font le web d'après