Yes, I also heard about it by @lightone of Fediverse Party who - like every year - wants to organize something special to celebrate. We are thinking about creating a post and a hashtag campaign, where this year we’d like to ‘flash-mob’ it to traditional social media, and attract some positive attention to fedi. Maybe by creating a whole bunch of funny memes for that.
I’ll pass this on to fediverse.party team (where I co-maintain the wiki), who may want to join SocialHub anyway 