KDE will be at #fosdem again this year. We will have a booth in building K (of course) where you can try Plasma Mobile, meet the developers and grab some cute Konqi stickers.
Also don't miss Volker Kraus, who will be presenting KDE Itineray on Saturday:
https://fosdem.org/2020/schedule/event/kde_itinerary/
and Akhil Gangadharan Kurungadathil, who will be presenting the new QML renderer in Kdenlive on Sunday:
Fosstodon is an English speaking Mastodon instance that is open to anyone who is interested in technology; particularly free & open source software.