Just like last year (and the years before) @YuzuRyo61 is managing the Misskey advent calendar for this year! The way this works is that each day of december is made available as a slot (like normal advent calendars), and users can register for a slot of their choosing. You can also input a description of what you want to do on the site to give others info on what they can expect.
The point of the whole thing is then that each user registered for a slot will publish any piece of content related to Misskey on their day, and give everyone else something nice to read/look at/listen to/engage whatever of their senses with on each day of December.
For example, I wrote an article about the growth spurt of the english Misskey userbase last year. and iirc @mametsuko@mk.absturztau.be wrote about emotes on Misskey. Many entries will be blog posts or the like, but the content is really freeform, so don't worry about doing something different. You'll also see that it's mostly japanese (being Misskey that should not be a surprise), but it's by no means restricted to that. I for example wrote my blog post in both english and japanese, and if I recall correctly mametsuko's was english only? Either way, don't let it scare you off.
この職業の日本語は分からないけどドイツの「Bundesbeauftragter für den Datenschutz und die Informationsfreiheit」という官職(この言葉は合ってる?)のUlrich Kelberさん(ulrichkelber@bonn.social)がインスタンスを建てて他のドイツの政府機関にアカウントを提供しながら管理している。そのインスタンスは2018年にもう建てた。KelberさんとKelberさんの政府機関はめっちゃいい仕事していると思う。
I like games, anime / manga, gunpla, vocaloid and many other things.Will post in german, english and japanese.I manage the german and english translations of Misskey (mostly the user interface), so if you notice any problems with those, please let me know via mentioning me in a post, a DM or similar and I will look into fixing the issue.---Misskeyのドイツ訳と英語訳の管理者です。翻訳に問題があれば、気楽に連絡してください。ドイツ語、英語と日本語で投稿します。#nobot